|
Yes, relay faults are standard faults with OM poweer and Acom.
Those Russian relays are vers poor quality.
I replaced them with original RJ1A by Jennings or Siemens labeled RJ1A.
Otherwise the Acom amps are very reliable and well protected.
In a multi tx environment however they might reset with ARCfault if their power meter detects RF.
?
Gu74b last about 2-3 years with heavy use at full power.
Most faults beside the relays are tube faults with OM Power amps.
Often additional item needs? to be replaced, especially in the sreen regualator circuitry.
Their HV fuse its the real joke, a standard mains fuse!
?
The 465 Euro are the price of FU728 which are new, not from the 70s.
OM Power also matches them, the pair is 970 Euro.
They never used Gu74b, only Gu84 and Gu78.
I bought NOS Gu74b in 1999 for 20,-? DM, Gu78 for 50,-
I never saw new shiny Gu74b, only the old stuiff.
?
Svetlana still exists.
The Svetlana labeled audio tubes for Electro-Harmonix are made at the Reflector factory but I have no idea about the transmit tubes:
?
?
73
Peter, DJ7WW
?
?
?
?
?
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-29T04:07:07+0100
Von: "Jim VE7RF" <jim.thom@...>
?
##? Ok, what typ goes wrong in Acom and OM power amps, tubes, or something else ???? ? ? Can u buy matched pairs of tubes ?? Jay at AS was telling me that the Acom amps all used either Taylor or Greenstone versions of a Jennings RJ1A / Kilovac HC-1.? Val told Jay that they had a solid 30% failure rate when bench tested... before any install.? And the 70% that tested good, plenty of those fail in the field. Jay told me he replaced em all with Gigavac GH1's ( gigavac's version of a RJ1A).? Jay said he replaced loads of em.?
?
The Pentalabs GU-74B and also the FU-728F are brand new, made in the chinese factory.? ?All? FU-728F's were always made in china.? The GU-74B? is brand new, NOT re-labeled.? They saw a market for it I guess, and started making em.?
?
My problem with the Ukraine and Russian GU-74B's is...they all have mid to late 70's date codes on em.? ?Eons ago, they were $50.00 USD.? then price went up to $75.00? ?Then it just kept increasing.?
?
Chinese? 8877 and also 3CX-800A7's are also high priced...... for what u are getting.?
?
What ever happened? to Svetlana ??? They made good tubes...and Econco can rebuild em too.? Glen, AE0Q, who answers all the alpha repair e-mail tells me that svetlana made a production run of GU-74B's back in 1990.? One year only...and they had a very shiny finish.? ?Never made after that.?
?
Folks who have? bad GU74B's in their acom amps? ( and I think OM-power also uses em)? ?tell me that when they cut em open, the control grid and also the screen grid? appears to have been overheated.? No way to cool the G1 and G2, only the anode.? ?
?
465 EU =? $504 USD.? ?That's still a fair amount....esp for a tube that was made in the mid to late 70's.?
?
?
|
All R&S amps use inductive tuning? in conjunction with switched anode capacitors, but no hot tuning.
Inductors are preset and necessary fine tuning is done with very low power.
I preset the inductor and use only capacitor tuning (Pi-L on 160 and 80m).
Both capacitors are at the back end of the coil and close to each other.
No, I don?t use a tuned input.
?
73
Peter, DJ7WW
?
?
?
?
?
?
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-29T03:13:32+0100
Von: "Jim VE7RF" <jim.thom@...>
##? I have the same RI-50 and also a spare RI-40 roller.? The newer RI-40 has the tapered pitch,? but is a drop in.? It's 3/8" x .072" ribbon.? It's built right, since it has 2 x gold contacts that pinch each side of the ribbon.?
Still, with any roller coil.... I would pre-set the coil 1st...then tweak the tune and load caps. That makes me cringe when seeing a roller being used to resonate the tank.?
When the newer RI-40 1st came out on the back cover of the high gloss SSON catalog, they had the tapered pitch at the front end of the coil...instead of the back end.? ?I phoned Bob Grinnell up at SSON asap, and he rectified it asap.?
With coil oriented front to back, you want the in and out? on the back end...with the permanent short at the font end.??
On my 3x3 setup,? I used? a .66 uh? pre-coil between plate block cap assy.... and the C1 tune cap.? ?Then 3/8" tubing at right angles behind the roller.? 3/8" tubing coil used for 20m. (with roller cranked to zero).? I used a 8 kv @ 40 amp HV solenoid to tap the coil for 15m..again roller cranked to zero.? ? The? 15m tap is re-used for 17m.... but the roller is increased to just 1/2 turn when on 17m..to get the Q back down.?
?
Peter, do u use a tuned input on ur 3CX-3000A7 ???
?
|
On Sun, Jan 28, 2024 at 09:13 PM, Peter Voelpel wrote:
Hi Jim,
?
I repaired so far OM4000A, OM3500A, Acom 2000A and Acom 1000 amplifiers.
?
The FU728F seems to be very critical reacting on too low heater voltage, unfortunately OM power is not using a dedicated heater transformer.
With a wrong tapping on the main transformers you can lose a pair of FU728F in the 4000 models very quickly.
?
Acom service information is far, far better then what you get from OM power and the amps are better constructed in my opinion as well.
?
The problem with the large triodes is that they don?t fit into those amplifiers.
3CX1500A7 and 3CX800A7 triodes are even more expensive then the Russian and Chinese tetrodes.
?
Pentalab is building Gu74b and FU-728F or do the just re-label tubes from common sources?
?
FU728F are 465 Euro at OM Power and Gu74b can be still sourced at reasonable prices in Ukraine.
?
Yes, variometers are far better then roller inductors without the moving contacts, the one used in that 4CX3K amp is wound with 6mm wire diameter and two windings are in parallel on the high bands.
?
73
Peter, DJ7WW
##? Ok, what typ goes wrong in Acom and OM power amps, tubes, or something else ???? ? ? Can u buy matched pairs of tubes ?? Jay at AS was telling me that the Acom amps all used either Taylor or Greenstone versions of a Jennings RJ1A / Kilovac HC-1.? Val told Jay that they had a solid 30% failure rate when bench tested... before any install.? And the 70% that tested good, plenty of those fail in the field. Jay told me he replaced em all with Gigavac GH1's ( gigavac's version of a RJ1A).? Jay said he replaced loads of em.?
?
The Pentalabs GU-74B and also the FU-728F are brand new, made in the chinese factory.? ?All? FU-728F's were always made in china.? The GU-74B? is brand new, NOT re-labeled.? They saw a market for it I guess, and started making em.?
?
My problem with the Ukraine and Russian GU-74B's is...they all have mid to late 70's date codes on em.? ?Eons ago, they were $50.00 USD.? then price went up to $75.00? ?Then it just kept increasing.?
?
Chinese? 8877 and also 3CX-800A7's are also high priced...... for what u are getting.?
?
What ever happened? to Svetlana ??? They made good tubes...and Econco can rebuild em too.? Glen, AE0Q, who answers all the alpha repair e-mail tells me that svetlana made a production run of GU-74B's back in 1990.? One year only...and they had a very shiny finish.? ?Never made after that.?
?
Folks who have? bad GU74B's in their acom amps? ( and I think OM-power also uses em)? ?tell me that when they cut em open, the control grid and also the screen grid? appears to have been overheated.? No way to cool the G1 and G2, only the anode.? ?
?
465 EU =? $504 USD.? ?That's still a fair amount....esp for a tube that was made in the mid to late 70's.?
?
|
Not going to argue , I wish you luck
On 2024-01-26 19:22, W7WRX wrote:
> Yes. I can get and have those parts.? I dont need them.? This one
> works.? You got some real junk over there that people have sent in. I
> am sure your flustered constantly getting junk show up. Burned up
> rollers.
>
> Hams can destroy anything.? You know that by now repairing amps!
> .
>
> On Jan 26, 2024 5:01 PM, "Amp Guy Llc via groups.io"
> <kb1sel@...> wrote:
>
> So you have a source for the two roller inductors , and all associated
>
> parts for them. You have the microy insulator used to mount the fixed
> caps on the c1 and c2 side
>
> Henry made the indictors at their factory they are un obtanium.
>
> I’ve had 4 come in , mine had all the updates and was no different
> than
> yours minus the input setup. I sold it as quick as I could after
> verifying proper operation. Sorry but you just don’t have experience
>
> with them as I do . And must not understand the issues that will occur
>
> and why. That amp has to be one of the worst pa’s ever designed.
>
> You will see
>
> Scott
>
> On 2024-01-26 16:25, W7WRX wrote:
>> There is nothing inside this thing I can't repair. It sounds like
> you
>> got a real hacked up amp. This one is as new with pretty much zero
>> hours on it.
>>
>>? C
>>
>> -------------------------
>>
>> From: [email protected] < [email protected]> on behalf
> of
>> Amp Guy Llc via groups.io <kb1sel@...>
>> Sent: Friday, January 26, 2024 4:23 PM
>> To: [email protected] < [email protected]>
>> Subject: Re: [ham-amplifiers] Tuned input
>>
>> Wait till the other issues occur that I had described . I strongly
>> suggest selling it while it works
>>
>> Scott
>>
>> On 2024-01-26 16:06, W7WRX wrote:
>>> I have compared the Tiny SA to my bench SA and its pretty close
>>> really. There are a few youtube videos where they compare it to a
>> real
>>> SA and its limitations are shown.? It is SUPER hand tool to have. I
>>> use to for aligning radios, checking Xtals, oscillators and all
>> sorts
>>> of stuff.
>>>
>>> Its $50 bucks. what do you expect.
>>>
>>> Jim, My brother has the 4 inch version.? I will ask him to bring it
>> by
>>> next time and will use it for comparison. I was going to order one
>> but
>>> really dont need it.
>>>
>>> I ran the same test again after work.? Using the method you
>> described
>>> with the Tiny SA.? Only I used the Henry with 2000 carrier.
>>>
>>> It shows best case -35 DB down for the second harmonic on 80
> meters.
>>> 10 meters shows about the same.
>>>
>>> I derailed the chain and manually adjusted the Loading inductor. It
>>> has no effect on harmonics that I could find. It has a clear peak
> on
>>> it, I tried 80, 15 and 10 meters.? They all peaked the same spot so
>>> that's good.
>>>
>>> I then put the Two inductors to exactly henrys position via the
>> guide
>>> I posted from service manual.? No improvement on harmonics. Only
>> less
>>> power output. My Friend told me at the factory they manually
>> adjusted
>>> that L for max output, hence He told me to do the same.? My amp was
>>> way out of time due to slipped collars and a derailed loading
> chain,
>>> so I had to start over.
>>>
>>> The henry is just dirty.? Thats all there is to it. It has NO tuned
>>> input, A shitty UNUN input mess and people just dealt with it.? I
>> bet
>>> I am probably the only one to ever measure this.
>>>
>>> I will have to report back when I get the tuned input board
>> installed.
>>>? I have a feeling it will be fixed and meet typical results.
>>>
>>> Remember I did use the tuned input board i built into the henry
> with
>>> coax and it offered a full 30 DB improvement. I think it will be
>>> better once the old input network is yanked out and this board is
>>> feeding the tube directly with a cap.
>>>
>>> Side note, I have not heard of anyone complaining about image sizes
>> it
>>> more than 15 years.
>>>
>>> C
>>>
>>>
>>> Links:
>>> ------
>>> [1] /g/ham-amplifiers/message/40111
>>> [2] /mt/103425499/8135091
>>> [3] /g/ham-amplifiers/post
>>> [4] /g/ham-amplifiers/editsub/8135091
>>> [5]
>>>
>>
>
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
> [1]
>> [1]
>>
>>
>>
>> Links:
>> ------
>> [1]
>>
>
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
> [1]
>> [2] /g/ham-amplifiers/message/40113
>> [3] /mt/103425499/8135091
>> [4] /g/ham-amplifiers/post
>> [5] /g/ham-amplifiers/editsub/8135091
>
>
>
> Links:
> ------
> [1]
>
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
> [2] /g/ham-amplifiers/message/40121
> [3] /mt/103425499/8135091
> [4] /g/ham-amplifiers/post
> [5] /g/ham-amplifiers/editsub/8135091
|
On Sun, Jan 28, 2024 at 09:29 PM, Peter Voelpel wrote:
I have no problem with the roller inductor in my 10-160m 3CX3K amp.
R&S used roller inductors in most of their transmitters.
?
?
?
73
Peter, DJ7WW
##? I have the same RI-50 and also a spare RI-40 roller.? The newer RI-40 has the tapered pitch,? but is a drop in.? It's 3/8" x .072" ribbon.? It's built right, since it has 2 x gold contacts that pinch each side of the ribbon.?
Still, with any roller coil.... I would pre-set the coil 1st...then tweak the tune and load caps. That makes me cringe when seeing a roller being used to resonate the tank.?
When the newer RI-40 1st came out on the back cover of the high gloss SSON catalog, they had the tapered pitch at the front end of the coil...instead of the back end.? ?I phoned Bob Grinnell up at SSON asap, and he rectified it asap.?
With coil oriented front to back, you want the in and out? on the back end...with the permanent short at the font end.??
On my 3x3 setup,? I used? a .66 uh? pre-coil between plate block cap assy.... and the C1 tune cap.? ?Then 3/8" tubing at right angles behind the roller.? 3/8" tubing coil used for 20m. (with roller cranked to zero).? I used a 8 kv @ 40 amp HV solenoid to tap the coil for 15m..again roller cranked to zero.? ? The? 15m tap is re-used for 17m.... but the roller is increased to just 1/2 turn when on 17m..to get the Q back down.?
?
Peter, do u use a tuned input on ur 3CX-3000A7 ???
|
Jim,?
?
that 10m limit is fixed if you erect a tower without providing special paper work and it? was valid from 1949.
?
That limit was last year extended to 15m height where? live know and 20m in the federal state where I lived before.
With the necessary calculations and paperwork you could always built higher towers.
At the old qth I could built up to 80m height if I wanted to (mil. airport 15km away).
Near that place I helped a friend 12 years ago to build up two LUSO towers with stacked yagis.
?
73
Peter, DJ7WW
?
38m high from 1982 to 1991 in Kerpen
?
?
?
?
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-28T18:25:04+0100
Von: "Jim VE7RF" <jim.thom@...>
An: "[email protected]" <[email protected]>
?
?
?
slk is not on google earth.?
?
peter, u are lucky u got the big towers up.... before they brought in the new german 10M ( 33') max height limit.??
?
|
I have no problem with the roller inductor in my 10-160m 3CX3K amp.
R&S used roller inductors in most of their transmitters.
?
?
?
73
Peter, DJ7WW
?
?
?
?
?
?
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-28T18:36:05+0100
Von: "Jim VE7RF" <jim.thom@...>
An: "[email protected]" <[email protected]>
?
?
?
On Sat, Jan 27, 2024 at 02:10 AM, Peter Voelpel wrote:
There are always other solutions possible.
A relay switched pi network with vacuum variables for instance.
There is no reason not to repair the amplifier if necessary.
I am sure you know that, with all the experience you are proud of.
73
Peter
Gimme a break, cut the guy some slack.? He's had 4 of those 8K's in his shop.? Trying to modify? them might be doable, but what a bitch of a job.? He spends 12 hrs per day, 5-6 days a week, all year round in his shop.? He has more experience than all of us combined.? ?I almost bought a new 8K myself, years ago, from Henry radio.? Decided against it at the last minute. Trying to resonate a tank, using a roller is dicey at best.? Even bear-el cautioned, with his KL-1, saying 1st not to use more than 75 watts of drive while tweaking the roller.... then in 2nd version of the manual, no more than 50 watts. How u are supposed to tweak the tank with less than 200w of drive is beyond me.?
I knew a fellow NE of me who had 3 of the 8k's, and asked if I could fix all of em.? I declined.? They were a mess.? At that point I was glad I didn't buy one myself.?
?
|
Hi Jim,
?
I repaired so far OM4000A, OM3500A, Acom 2000A and Acom 1000 amplifiers.
?
The FU728F seems to be very critical reacting on too low heater voltage, unfortunately OM power is not using a dedicated heater transformer.
With a wrong tapping on the main transformers you can loose a pair of FU728F in the 4000 models very quickly.
?
Acom service information is far, far better then what you get from OM power and the amps are better constructed in my opinion as well.
?
The problem with the large triodes is that they don?t fit into those amplifiers.
3CX1500A7 and 3CX800A7 triodes are even more expensive then the Russian and Chinese tetrodes.
?
Pentalab is building Gu74b and FU-728F or do the just relable tubes from common sources?
?
FU728F are 465 Euro at OM Power and Gu74b can be still sourced at reasonable prices in Ukraine.
?
Yes, variometers are far better then roller inductors without the moving contacts, the one used in that 4CX3K amp is wound with 6mm wire diameter and two windings are in parallel on the high bands.
?
73
Peter, DJ7WW
?
?
?
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-28T18:52:42+0100
Von: "Jim VE7RF" <jim.thom@...>
An: "[email protected]" <[email protected]>
?
?
?
On Sat, Jan 27, 2024 at 08:00 AM, Peter Voelpel wrote:
There is no coil tapping, the vacuum relays switch the capacitors not coil taps.
He has no 8020, he is looking for one.
And there is no microprocessor in that amplifier.
The OM power amplifiers are not complex either, just semi automatic as well with presets written into an EEPROM.
73
Peter, DJ7WW
?Have u repaired an OM-power amp ?? ?Or any of the Acom amps ??
DXE wants $999.99? for a new, Pentalab GU-74B.
DXE wants $1599.99? for a new? Pentalab FU-728F.?
?
That's a lotta $$ to re-tube an amp, esp if it's a 2 x holer, like the OM-4001
?
Jay at AS? was both an Acom dealer ( for 20 yrs)..then an OM-power dealer.? ?The problem from a dealer point of view is.... the dealer has to fix em under warranty...and does NOT get paid either...except for parts. They only get paid for out of warranty repairs. They have both gotten so complex that in warranty repairs, just ate up the profit selling em.? ?DXE can't repair acom or om power....so is looking for folks to help em out.?
?
Meanwhile, brand new triodes, like the? 3x3, 3x6, 3x10, and 3x15? ?from Pentalabs is a bargain.? Much better deal vs? a tetrode.?
?
Using a variometer as an adjustable coil is a new twist.? The current in the rotating link coil is massive.? But he has 3 or 4 of em.? ?Very slick approach.? More reliable than a roller.?
?
|
On Sat, Jan 27, 2024 at 08:00 AM, Peter Voelpel wrote:
There is no coil tapping, the vacuum relays switch the capacitors not coil taps.
He has no 8020, he is looking for one.
And there is no microprocessor in that amplifier.
The OM power amplifiers are not complex either, just semi automatic as well with presets written into an EEPROM.
73
Peter, DJ7WW
?Have u repaired an OM-power amp ?? ?Or any of the Acom amps ??
DXE wants $999.99? for a new, Pentalab GU-74B.
DXE wants $1599.99? for a new? Pentalab FU-728F.?
?
That's a lotta $$ to re-tube an amp, esp if it's a 2 x holer, like the OM-4001
?
Jay at AS? was both an Acom dealer ( for 20 yrs)..then an OM-power dealer.? ?The problem from a dealer point of view is.... the dealer has to fix em under warranty...and does NOT get paid either...except for parts. They only get paid for out of warranty repairs. They have both gotten so complex that in warranty repairs, just ate up the profit selling em.? ?DXE can't repair acom or om power....so is looking for folks to help em out.?
?
Meanwhile, brand new triodes, like the? 3x3, 3x6, 3x10, and 3x15? ?from Pentalabs is a bargain.? Much better deal vs? a tetrode.?
?
Using a variometer as an adjustable coil is a new twist.? The current in the rotating link coil is massive.? But he has 3 or 4 of em.? ?Very slick approach.? More reliable than a roller.?
|
On Sat, Jan 27, 2024 at 02:10 AM, Peter Voelpel wrote:
There are always other solutions possible.
A relay switched pi network with vacuum variables for instance.
There is no reason not to repair the amplifier if necessary.
I am sure you know that, with all the experience you are proud of.
73
Peter
Gimme a break, cut the guy some slack.? He's had 4 of those 8K's in his shop.? Trying to modify? them might be doable, but what a bitch of a job.? He spends 12 hrs per day, 5-6 days a week, all year round in his shop.? He has more experience than all of us combined.? ?I almost bought a new 8K myself, years ago, from Henry radio.? Decided against it at the last minute. Trying to resonate a tank, using a roller is dicey at best.? Even bear-el cautioned, with his KL-1, saying 1st not to use more than 75 watts of drive while tweaking the roller.... then in 2nd version of the manual, no more than 50 watts. How u are supposed to tweak the tank with less than 200w of drive is beyond me.?
I knew a fellow NE of me who had 3 of the 8k's, and asked if I could fix all of em.? I declined.? They were a mess.? At that point I was glad I didn't buy one myself.?
|
slk is not on google earth.?
?
peter, u are lucky u got the big towers up.... before they brought in the new german 10M ( 33') max height limit.??
|
Just woke up and typed this on my phone. Auto correct can really screwy things up. Here is a revision with corrections
Hard to tell from the pics, he has built some nice stuff.
I still wouldn’t use them to switch padding caps or use padding caps for the output network. But that’s me. What is the band switch current rating
Have you ever built any high powered tube pa’s. If so can you share some pics.
I miss read about the 8020 , can be hard to find. One I was
I had the latest serial number in the ham world.
Came out of a faa facility and was used with a mega rotating log periodic.
Complex as in lot of components and not a fan of surface mount. As I said overloaded with everything else and certain others warned me to stay away from those pa’s. I learned in my 30’s to listen to advice that makes sense. Especially if it is coming from an intelligent person. Two of them post in this group.
Ever see a hf80 series pa in person or detailed internal pics. I had to diagnose and repair the control boards. The exciters and receivers had a whole bunch of tantalum caps that were prone to failing, also had to repair.
Powered the 8021 and 8022 with a large onan generator then a modified phase perfect electronic phase converter.
But again parts hard to source . As the 8k
All parts in the 3x6 and 4x15 I have and are easily sourced and have triplicates of nearly everything even though would probably never need. Even have 3 extra 3000 pf Jennings vacuum variables that I use on the load side. Those are becoming harder to find.
I gave jim one of those 4000 pf caps you spoke of and offered him another . I’ll never use it.
As far as the 4000 pf cap, other than being smaller and being able to fit in a tight rf deck. 4000 pf isn’t needed to get down on 160 in the 3x6 or 4x15.
The 4x15 has grid and plate current overload circuits , a control grid interlock , magnehelic photohelic meter so if one of the 3 kooltronic kbb63 blowers failed it would shut the pa down, metering for everything , current meters for all supplies other then the filament. I’m going to off it though too big.
No one will probably buy it for what it is worth so will most likely sit in the corner. I’ll be making some videos on it in the future . Im in a new house now and need the service upgraded. When I test the hi powered pa’s into my 20kw load the line voltage says like crazy. I have a large enough transformer on the street 50kva. Problem is a crazy long secondary run to my meter base. Im going to upgrade to 400 amp like my last house but have the primary run to the side of my house and have transformer placed near my meter base.
I don’t run big power on the radio , only into dummy loads. This spring I will get up a couple full wave loops. Little over 2 acres here lots of trees.
Can ask why I used 3 kbb 63 blowers, got 9 for 20 bucks each. Blower is around 900 new. Three give me max anode dissipation at a certain intake temp . Pa has a thermal switch below the tube socket to shut the pa down if the temp is exceeded.
I think someone would have to be nuts to run a big tetrode with no screen overload protection.
I would never build a pa with hard to source parts especially a hard to source tube.
Ps all the hf80 stuff can be seen on my site. Was cool but wanted a house at 31 and no mortgage. House made more sense. Sold them for a premium.
I just don’t believe in making something with a big tube or any tube if the pa has to be babied. A 20 amp variable inductor for a 4x10 is silly. If building from scratch why not use the proper components. Things can be had for cheap if you look around and take your time
toggle quoted message
Show quoted text
On 2024-01-27 00:00, Peter Voelpel wrote: There is no coil tapping, the vacuum relays switch the capacitors not coil taps.
He has no 8020, he is looking for one.
And there is no microprocessor in that amplifier.
The OM power amplifiers are not complex either, just semi automatic as well with presets written into an EEPROM.
73
Peter, DJ7WW
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T03:19:22+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
Neat but not too keen on using vac relays for the coil tapping
especially on the upper bands.
When you get into big power especially high duty cycle modes you need
super robust components .
I see he has a 8020 . I owned a 8020,8021 and 8022 . I am
Still buddies with the man who designed most of each pa. Neat stuff
but a major pain to maintain. One off parts which are very difficult to
obtain. Sold it all when I bought my first house.
Bruce Gary at Gary engineering made some auto tune tube tetrode with
handle pa’s. He sold them to guys in the Middle East. Unfortunately now
silent key. Was a brilliant man. He fixed some botched tetrodes made by
a guy in ca. if you go to his qrz page it has a pic of him rebuilding
one for a guy in the Middle East.
I prefer simplicity and ccs duty cycle rating of a Pa.
I’d just use the vernier dials on the control box and have a chart for
the rough setting on each band. I’m not a big fan of anything micro
processor controlled. I was recently contacted by dx engineering to be a
warranty repair center for acom and om power tube pa’s. So swamped with
the other amps I thanked them and turned the offer down. Those pa’s are
very complex.
Another issue with the 8k is all it can take is once or twice of
adjusting the roller while the pa is keyed at mid or full output to do
damage to the wheel and or inductor . The Rockwell pa’s tuned in steps .
From a lower power level coarse tune to then higher which was the fine
tune.
On 2024-01-26 18:43, Peter Voelpel wrote:
A friend of mine built that around a 4CX3000A and the same can be
easily done to the 8K Ultra.
He made it semi automatic as the 8K and uses a variometer, switched
anode capacitors and a 4000pf vacuum variable load cap..
Goal is full autotune.
Scroll on his qrz page down 3/4 of the page:
73
Peter, DJ7WW
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T02:22:44+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
My thoughts exactly
If I end up getting this parts 8k, I’ll keep the carcass and do the
following
Remove variable inductors and all fixed caps. Install a vac variable on
the plate and one on the load side. Use the current load cap motor to
turn the new load cap. Use the l1 coil motor to turn the new plate vac
variable. Both capacitors enough range to not need padding caps. Then
for the inductor a fixed coil and use the a similar flapper setup but
modified for more current to progressive short the coil which will be a
standard pi network.
Input would have fixed pi networks for each band.
Just an idea would be a long while before I would have time to do. Have
to complete the 3x6 and wrap up my 4x15 so can sell it.
I’ll be selling all the non needed 8k parts but won’t be cheap.
Lotta dead 8k ultras out there that need inductors. I have turned down
many in need of repair. Just cannot get the parts.
On 2024-01-26 18:10, Peter Voelpel wrote:
There are always other solutions possible.
A relay switched pi network with vacuum variables for instance.
There is no reason not to repair the amplifier if necessary.
I am sure you know that, with all the experience you are proud of.
73
Peter
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T01:01:32+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
So you have a source for the two roller inductors , and all associated
parts for them. You have the microy insulator used to mount the fixed
caps on the c1 and c2 side
Henry made the indictors at their factory they are un obtanium.
I’ve had 4 come in , mine had all the updates and was no different
than
yours minus the input setup. I sold it as quick as I could after
verifying proper operation. Sorry but you just don’t have experience
with them as I do . And must not understand the issues that will occur
and why. That amp has to be one of the worst pa’s ever designed.
You will see
Scott
On 2024-01-26 16:25, W7WRX wrote:
There is nothing inside this thing I can't repair. It sounds like you
got a real hacked up amp. This one is as new with pretty much zero
hours on it.
C
-------------------------
From: [email protected] <[email protected]> on behalf
of
Amp Guy Llc via groups.io <kb1sel@...>
Sent: Friday, January 26, 2024 4:23 PM
To: [email protected] <[email protected]>
Subject: Re: [ham-amplifiers] Tuned input
Wait till the other issues occur that I had described . I strongly
suggest selling it while it works
Scott
On 2024-01-26 16:06, W7WRX wrote:
I have compared the Tiny SA to my bench SA and its pretty close
really. There are a few youtube videos where they compare it to a real
SA and its limitations are shown. It is SUPER hand tool to have. I
use to for aligning radios, checking Xtals, oscillators and all sorts
of stuff.
Its $50 bucks. what do you expect.
Jim, My brother has the 4 inch version. I will ask him to bring it by
next time and will use it for comparison. I was going to order one but
really dont need it.
I ran the same test again after work. Using the method you described
with the Tiny SA. Only I used the Henry with 2000 carrier.
It shows best case -35 DB down for the second harmonic on 80 meters.
10 meters shows about the same.
I derailed the chain and manually adjusted the Loading inductor. It
has no effect on harmonics that I could find. It has a clear peak on
it, I tried 80, 15 and 10 meters. They all peaked the same spot so
that's good.
I then put the Two inductors to exactly henrys position via the guide
I posted from service manual. No improvement on harmonics. Only less
power output. My Friend told me at the factory they manually adjusted
that L for max output, hence He told me to do the same. My amp was
way out of time due to slipped collars and a derailed loading chain,
so I had to start over.
The henry is just dirty. Thats all there is to it. It has NO tuned
input, A shitty UNUN input mess and people just dealt with it. I bet
I am probably the only one to ever measure this.
I will have to report back when I get the tuned input board installed.
I have a feeling it will be fixed and meet typical results.
Remember I did use the tuned input board i built into the henry with
coax and it offered a full 30 DB improvement. I think it will be
better once the old input network is yanked out and this board is
feeding the tube directly with a cap.
Side note, I have not heard of anyone complaining about image sizes it
more than 15 years.
C
Links:
------
[1] /g/ham-amplifiers/message/40111
[2] /mt/103425499/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
Links:
------
[1]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[2] /g/ham-amplifiers/message/40113
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091 ?
?
?
|
Hard to tell from the pics
I still wouldn’t use them to switch padding caps or use padding caps for the output network. But that’s me. What is the band switch current rating
Have you ever built any high powered tube pa’s. If so can you share some pics.
I miss read about the 8020 , can be hard to find. One I had was what I was told the latest know. serial number in the ham world.
Came out of a faa facility and was used with a mega rotating log periodic.
Complex as in lot of components and not a fan of surface mount. As I said overloaded with everything else and certain others warned me to stay away from those pa’s. I learned in my 30’s to listen to advice that makes sense. Especially if it is coming from an intelligent person. Two of them post in this group.
Ever see a hf80 series pa in person or detailed internal pics. I had to diagnose and repair the control boards. The exciters and receivers had a whole bunch of tantalum caps that were prone to failing, also had to repair.
Powered the 8021 and 8022 with a large onan generator then a modified phase perfect electronic phase converter.
But again parts hard to source . As the 8k
All parts in the 3x6 and 4x15 I have area easily sourced and have triplicates of nearly everything even though would probably never need. Even have 3 extra 3000 pf Jennings vacuum variables that I use on the load side. Those are becoming harder to find.
I gave him one of those 4000 of caps you spoke of and offered him another . I’ll never use it.
As far as the 4000 of cap, other than being smaller and being able to fit in a tight rf deck. 4000 pf isn’t needed to get down on 160 in the 3x6 or 4x15.
The 4x15 has grid and plate current overload circuit , a control grid interlock , magnehelic photohelic meter so if one of the 3 kooltronic kbb63 blowers failed it would shut the pa down, metering for everything , current meters for all supplies other the filament. I’m going to off it though too big.
No one will probably buy it for what it is worth so will most likely sit in the corner. I’ll be making some videos on it in the future . Im in a new house now and need the service upgraded. When I test the hi powered pa’s into my 20kw load the line voltage says like crazy. I have a large enough transformer on the street 50kva. Problem is a crazy long secondary run to my meter base. Im going to upgrade to 400 amp like my last house but have the primary run to the side of my house and have transformer placed near my meter base.
I don’t run big power on the radio , only into dummy loads. This spring I will get up a couple full wave loops. Little over 2 acres here lots of trees.
Can ask why I used 3 kbb 63 blowers, got 9 for 20 bucks each. Blower is around 900 new. Three give me max anode dissipation at a maximum intake temp I don’t remember what it was. But has a thermal switch below the tube socket to shut the pa down if the temp is exceeded.
I think someone would have to be nuts to run a big tetrode with no screen overload protection.
I would never build a pa with hard to source parts especially a hard to source tube.
Ps all the hf80 stuff can be seen on my site. Was cool but wanted a house at 31 and no mortgage. House made more sense. Sold them for a premium.
I just don’t believe in making something with a big tube or any tube if the pa has to be babied. A 20 amp variable inductor for a 4x20 is silly. If building from scratch why not use the proper components. Things can be had for cheap if you look around and take your time.
toggle quoted message
Show quoted text
On 2024-01-27 00:00, Peter Voelpel wrote: There is no coil tapping, the vacuum relays switch the capacitors not coil taps.
He has no 8020, he is looking for one.
And there is no microprocessor in that amplifier.
The OM power amplifiers are not complex either, just semi automatic as well with presets written into an EEPROM.
73
Peter, DJ7WW
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T03:19:22+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
Neat but not too keen on using vac relays for the coil tapping
especially on the upper bands.
When you get into big power especially high duty cycle modes you need
super robust components .
I see he has a 8020 . I owned a 8020,8021 and 8022 . I am
Still buddies with the man who designed most of each pa. Neat stuff
but a major pain to maintain. One off parts which are very difficult to
obtain. Sold it all when I bought my first house.
Bruce Gary at Gary engineering made some auto tune tube tetrode with
handle pa’s. He sold them to guys in the Middle East. Unfortunately now
silent key. Was a brilliant man. He fixed some botched tetrodes made by
a guy in ca. if you go to his qrz page it has a pic of him rebuilding
one for a guy in the Middle East.
I prefer simplicity and ccs duty cycle rating of a Pa.
I’d just use the vernier dials on the control box and have a chart for
the rough setting on each band. I’m not a big fan of anything micro
processor controlled. I was recently contacted by dx engineering to be a
warranty repair center for acom and om power tube pa’s. So swamped with
the other amps I thanked them and turned the offer down. Those pa’s are
very complex.
Another issue with the 8k is all it can take is once or twice of
adjusting the roller while the pa is keyed at mid or full output to do
damage to the wheel and or inductor . The Rockwell pa’s tuned in steps .
From a lower power level coarse tune to then higher which was the fine
tune.
On 2024-01-26 18:43, Peter Voelpel wrote:
A friend of mine built that around a 4CX3000A and the same can be
easily done to the 8K Ultra.
He made it semi automatic as the 8K and uses a variometer, switched
anode capacitors and a 4000pf vacuum variable load cap..
Goal is full autotune.
Scroll on his qrz page down 3/4 of the page:
73
Peter, DJ7WW
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T02:22:44+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
My thoughts exactly
If I end up getting this parts 8k, I’ll keep the carcass and do the
following
Remove variable inductors and all fixed caps. Install a vac variable on
the plate and one on the load side. Use the current load cap motor to
turn the new load cap. Use the l1 coil motor to turn the new plate vac
variable. Both capacitors enough range to not need padding caps. Then
for the inductor a fixed coil and use the a similar flapper setup but
modified for more current to progressive short the coil which will be a
standard pi network.
Input would have fixed pi networks for each band.
Just an idea would be a long while before I would have time to do. Have
to complete the 3x6 and wrap up my 4x15 so can sell it.
I’ll be selling all the non needed 8k parts but won’t be cheap.
Lotta dead 8k ultras out there that need inductors. I have turned down
many in need of repair. Just cannot get the parts.
On 2024-01-26 18:10, Peter Voelpel wrote:
There are always other solutions possible.
A relay switched pi network with vacuum variables for instance.
There is no reason not to repair the amplifier if necessary.
I am sure you know that, with all the experience you are proud of.
73
Peter
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T01:01:32+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
So you have a source for the two roller inductors , and all associated
parts for them. You have the microy insulator used to mount the fixed
caps on the c1 and c2 side
Henry made the indictors at their factory they are un obtanium.
I’ve had 4 come in , mine had all the updates and was no different
than
yours minus the input setup. I sold it as quick as I could after
verifying proper operation. Sorry but you just don’t have experience
with them as I do . And must not understand the issues that will occur
and why. That amp has to be one of the worst pa’s ever designed.
You will see
Scott
On 2024-01-26 16:25, W7WRX wrote:
There is nothing inside this thing I can't repair. It sounds like you
got a real hacked up amp. This one is as new with pretty much zero
hours on it.
C
-------------------------
From: [email protected] <[email protected]> on behalf
of
Amp Guy Llc via groups.io <kb1sel@...>
Sent: Friday, January 26, 2024 4:23 PM
To: [email protected] <[email protected]>
Subject: Re: [ham-amplifiers] Tuned input
Wait till the other issues occur that I had described . I strongly
suggest selling it while it works
Scott
On 2024-01-26 16:06, W7WRX wrote:
I have compared the Tiny SA to my bench SA and its pretty close
really. There are a few youtube videos where they compare it to a real
SA and its limitations are shown. It is SUPER hand tool to have. I
use to for aligning radios, checking Xtals, oscillators and all sorts
of stuff.
Its $50 bucks. what do you expect.
Jim, My brother has the 4 inch version. I will ask him to bring it by
next time and will use it for comparison. I was going to order one but
really dont need it.
I ran the same test again after work. Using the method you described
with the Tiny SA. Only I used the Henry with 2000 carrier.
It shows best case -35 DB down for the second harmonic on 80 meters.
10 meters shows about the same.
I derailed the chain and manually adjusted the Loading inductor. It
has no effect on harmonics that I could find. It has a clear peak on
it, I tried 80, 15 and 10 meters. They all peaked the same spot so
that's good.
I then put the Two inductors to exactly henrys position via the guide
I posted from service manual. No improvement on harmonics. Only less
power output. My Friend told me at the factory they manually adjusted
that L for max output, hence He told me to do the same. My amp was
way out of time due to slipped collars and a derailed loading chain,
so I had to start over.
The henry is just dirty. Thats all there is to it. It has NO tuned
input, A shitty UNUN input mess and people just dealt with it. I bet
I am probably the only one to ever measure this.
I will have to report back when I get the tuned input board installed.
I have a feeling it will be fixed and meet typical results.
Remember I did use the tuned input board i built into the henry with
coax and it offered a full 30 DB improvement. I think it will be
better once the old input network is yanked out and this board is
feeding the tube directly with a cap.
Side note, I have not heard of anyone complaining about image sizes it
more than 15 years.
C
Links:
------
[1] /g/ham-amplifiers/message/40111
[2] /mt/103425499/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
Links:
------
[1]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[2] /g/ham-amplifiers/message/40113
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091 ?
?
?
|
Not going to argue , I wish you luck
toggle quoted message
Show quoted text
On 2024-01-26 19:22, W7WRX wrote: Yes. I can get and have those parts. I dont need them. This one
works. You got some real junk over there that people have sent in. I
am sure your flustered constantly getting junk show up. Burned up
rollers.
Hams can destroy anything. You know that by now repairing amps!
.
On Jan 26, 2024 5:01 PM, "Amp Guy Llc via groups.io"
<kb1sel@...> wrote:
So you have a source for the two roller inductors , and all associated
parts for them. You have the microy insulator used to mount the fixed
caps on the c1 and c2 side
Henry made the indictors at their factory they are un obtanium.
I’ve had 4 come in , mine had all the updates and was no different
than
yours minus the input setup. I sold it as quick as I could after
verifying proper operation. Sorry but you just don’t have experience
with them as I do . And must not understand the issues that will occur
and why. That amp has to be one of the worst pa’s ever designed.
You will see
Scott
On 2024-01-26 16:25, W7WRX wrote:
There is nothing inside this thing I can't repair. It sounds like you
got a real hacked up amp. This one is as new with pretty much zero
hours on it.
C
-------------------------
From: [email protected] <[email protected]> on behalf of
Amp Guy Llc via groups.io <kb1sel@...>
Sent: Friday, January 26, 2024 4:23 PM
To: [email protected] <[email protected]>
Subject: Re: [ham-amplifiers] Tuned input
Wait till the other issues occur that I had described . I strongly
suggest selling it while it works
Scott
On 2024-01-26 16:06, W7WRX wrote:
I have compared the Tiny SA to my bench SA and its pretty close
really. There are a few youtube videos where they compare it to a real
SA and its limitations are shown. It is SUPER hand tool to have. I
use to for aligning radios, checking Xtals, oscillators and all sorts
of stuff.
Its $50 bucks. what do you expect.
Jim, My brother has the 4 inch version. I will ask him to bring it by
next time and will use it for comparison. I was going to order one but
really dont need it.
I ran the same test again after work. Using the method you described
with the Tiny SA. Only I used the Henry with 2000 carrier.
It shows best case -35 DB down for the second harmonic on 80 meters.
10 meters shows about the same.
I derailed the chain and manually adjusted the Loading inductor. It
has no effect on harmonics that I could find. It has a clear peak
on
it, I tried 80, 15 and 10 meters. They all peaked the same spot so
that's good.
I then put the Two inductors to exactly henrys position via the guide
I posted from service manual. No improvement on harmonics. Only less
power output. My Friend told me at the factory they manually adjusted
that L for max output, hence He told me to do the same. My amp was
way out of time due to slipped collars and a derailed loading
chain,
so I had to start over.
The henry is just dirty. Thats all there is to it. It has NO tuned
input, A shitty UNUN input mess and people just dealt with it. I bet
I am probably the only one to ever measure this.
I will have to report back when I get the tuned input board installed.
I have a feeling it will be fixed and meet typical results.
Remember I did use the tuned input board i built into the henry
with
coax and it offered a full 30 DB improvement. I think it will be
better once the old input network is yanked out and this board is
feeding the tube directly with a cap.
Side note, I have not heard of anyone complaining about image sizes it
more than 15 years.
C
Links:
------
[1] /g/ham-amplifiers/message/40111
[2] /mt/103425499/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
[1]
Links:
------
[1]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
[2] /g/ham-amplifiers/message/40113
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091 Links:
------
[1] /g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[2] /g/ham-amplifiers/message/40121
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091
|
There is no coil tapping, the vacuum relays switch the capacitors not coil taps. He has no 8020, he is looking for one. And there is no microprocessor in that amplifier. The OM power amplifiers are not complex either, just semi automatic as well with presets written into an EEPROM. 73 Peter, DJ7WW -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] Tuned input Datum: 2024-01-27T03:19:22+0100 Von: "Amp Guy Llc" <kb1sel@...> An: " [email protected]" < [email protected]> Neat but not too keen on using vac relays for the coil tapping especially on the upper bands. When you get into big power especially high duty cycle modes you need super robust components . I see he has a 8020 . I owned a 8020,8021 and 8022 . I am Still buddies with the man who designed most of each pa. Neat stuff but a major pain to maintain. One off parts which are very difficult to obtain. Sold it all when I bought my first house. Bruce Gary at Gary engineering made some auto tune tube tetrode with handle pa’s. He sold them to guys in the Middle East. Unfortunately now silent key. Was a brilliant man. He fixed some botched tetrodes made by a guy in ca. if you go to his qrz page it has a pic of him rebuilding one for a guy in the Middle East. I prefer simplicity and ccs duty cycle rating of a Pa. I’d just use the vernier dials on the control box and have a chart for the rough setting on each band. I’m not a big fan of anything micro processor controlled. I was recently contacted by dx engineering to be a warranty repair center for acom and om power tube pa’s. So swamped with the other amps I thanked them and turned the offer down. Those pa’s are very complex. Another issue with the 8k is all it can take is once or twice of adjusting the roller while the pa is keyed at mid or full output to do damage to the wheel and or inductor . The Rockwell pa’s tuned in steps . From a lower power level coarse tune to then higher which was the fine tune. On 2024-01-26 18:43, Peter Voelpel wrote: A friend of mine built that around a 4CX3000A and the same can be
easily done to the 8K Ultra.
He made it semi automatic as the 8K and uses a variometer, switched
anode capacitors and a 4000pf vacuum variable load cap..
Goal is full autotune.
Scroll on his qrz page down 3/4 of the page:
73
Peter, DJ7WW
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T02:22:44+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
My thoughts exactly
If I end up getting this parts 8k, I’ll keep the carcass and do the
following
Remove variable inductors and all fixed caps. Install a vac variable on
the plate and one on the load side. Use the current load cap motor to
turn the new load cap. Use the l1 coil motor to turn the new plate vac
variable. Both capacitors enough range to not need padding caps. Then
for the inductor a fixed coil and use the a similar flapper setup but
modified for more current to progressive short the coil which will be a
standard pi network.
Input would have fixed pi networks for each band.
Just an idea would be a long while before I would have time to do. Have
to complete the 3x6 and wrap up my 4x15 so can sell it.
I’ll be selling all the non needed 8k parts but won’t be cheap.
Lotta dead 8k ultras out there that need inductors. I have turned down
many in need of repair. Just cannot get the parts.
On 2024-01-26 18:10, Peter Voelpel wrote:
There are always other solutions possible.
A relay switched pi network with vacuum variables for instance.
There is no reason not to repair the amplifier if necessary.
I am sure you know that, with all the experience you are proud of.
73
Peter
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T01:01:32+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
So you have a source for the two roller inductors , and all associated
parts for them. You have the microy insulator used to mount the fixed
caps on the c1 and c2 side
Henry made the indictors at their factory they are un obtanium.
I’ve had 4 come in , mine had all the updates and was no different
than
yours minus the input setup. I sold it as quick as I could after
verifying proper operation. Sorry but you just don’t have experience
with them as I do . And must not understand the issues that will occur
and why. That amp has to be one of the worst pa’s ever designed.
You will see
Scott
On 2024-01-26 16:25, W7WRX wrote:
There is nothing inside this thing I can't repair. It sounds like you
got a real hacked up amp. This one is as new with pretty much zero
hours on it.
C
-------------------------
From: [email protected] <[email protected]> on behalf
of
Amp Guy Llc via groups.io <kb1sel@...>
Sent: Friday, January 26, 2024 4:23 PM
To: [email protected] <[email protected]>
Subject: Re: [ham-amplifiers] Tuned input
Wait till the other issues occur that I had described . I strongly
suggest selling it while it works
Scott
On 2024-01-26 16:06, W7WRX wrote:
I have compared the Tiny SA to my bench SA and its pretty close
really. There are a few youtube videos where they compare it to a real
SA and its limitations are shown. It is SUPER hand tool to have. I
use to for aligning radios, checking Xtals, oscillators and all sorts
of stuff.
Its $50 bucks. what do you expect.
Jim, My brother has the 4 inch version. I will ask him to bring it by
next time and will use it for comparison. I was going to order one but
really dont need it.
I ran the same test again after work. Using the method you described
with the Tiny SA. Only I used the Henry with 2000 carrier.
It shows best case -35 DB down for the second harmonic on 80 meters.
10 meters shows about the same.
I derailed the chain and manually adjusted the Loading inductor. It
has no effect on harmonics that I could find. It has a clear peak on
it, I tried 80, 15 and 10 meters. They all peaked the same spot so
that's good.
I then put the Two inductors to exactly henrys position via the guide
I posted from service manual. No improvement on harmonics. Only less
power output. My Friend told me at the factory they manually adjusted
that L for max output, hence He told me to do the same. My amp was
way out of time due to slipped collars and a derailed loading chain,
so I had to start over.
The henry is just dirty. Thats all there is to it. It has NO tuned
input, A shitty UNUN input mess and people just dealt with it. I bet
I am probably the only one to ever measure this.
I will have to report back when I get the tuned input board installed.
I have a feeling it will be fixed and meet typical results.
Remember I did use the tuned input board i built into the henry with
coax and it offered a full 30 DB improvement. I think it will be
better once the old input network is yanked out and this board is
feeding the tube directly with a cap.
Side note, I have not heard of anyone complaining about image sizes it
more than 15 years.
C
Links:
------
[1] /g/ham-amplifiers/message/40111
[2] /mt/103425499/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
Links:
------
[1]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[2] /g/ham-amplifiers/message/40113
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091
?
?
?
|
Yes. I can get and have those parts.? I dont need them.? This one works.? You got some real junk over there that people have sent in. I am sure your flustered constantly getting junk show up. Burned up rollers.??
Hams can destroy anything.? You know that by now repairing amps!
.??
So you have a source for the two roller inductors , and all associated
parts for them. You have the microy insulator used to mount the fixed
caps on the c1 and c2 side
Henry made the indictors at their factory they are un obtanium.
I’ve had 4 come in , mine had all the updates and was no different than
yours minus the input setup. I sold it as quick as I could after
verifying proper operation. Sorry but you just don’t have experience
with them as I do . And must not understand the issues that will occur
and why. That amp has to be one of the worst pa’s ever designed.
You will see
Scott
On 2024-01-26 16:25, W7WRX wrote:
> There is nothing inside this thing I can't repair. It sounds like you
> got a real hacked up amp. This one is as new with pretty much zero
> hours on it.
>
>? C
>
> -------------------------
>
> From: [email protected] < [email protected]> on behalf of
> Amp Guy Llc via groups.io <kb1sel@...>
> Sent: Friday, January 26, 2024 4:23 PM
> To: [email protected] < [email protected]>
> Subject: Re: [ham-amplifiers] Tuned input
>
> Wait till the other issues occur that I had described . I strongly
> suggest selling it while it works
>
> Scott
>
> On 2024-01-26 16:06, W7WRX wrote:
>> I have compared the Tiny SA to my bench SA and its pretty close
>> really. There are a few youtube videos where they compare it to a
> real
>> SA and its limitations are shown.? It is SUPER hand tool to have. I
>> use to for aligning radios, checking Xtals, oscillators and all
> sorts
>> of stuff.
>>
>> Its $50 bucks. what do you expect.
>>
>> Jim, My brother has the 4 inch version.? I will ask him to bring it
> by
>> next time and will use it for comparison. I was going to order one
> but
>> really dont need it.
>>
>> I ran the same test again after work.? Using the method you
> described
>> with the Tiny SA.? Only I used the Henry with 2000 carrier.
>>
>> It shows best case -35 DB down for the second harmonic on 80 meters.
>> 10 meters shows about the same.
>>
>> I derailed the chain and manually adjusted the Loading inductor. It
>> has no effect on harmonics that I could find. It has a clear peak on
>> it, I tried 80, 15 and 10 meters.? They all peaked the same spot so
>> that's good.
>>
>> I then put the Two inductors to exactly henrys position via the
> guide
>> I posted from service manual.? No improvement on harmonics. Only
> less
>> power output. My Friend told me at the factory they manually
> adjusted
>> that L for max output, hence He told me to do the same.? My amp was
>> way out of time due to slipped collars and a derailed loading chain,
>> so I had to start over.
>>
>> The henry is just dirty.? Thats all there is to it. It has NO tuned
>> input, A shitty UNUN input mess and people just dealt with it.? I
> bet
>> I am probably the only one to ever measure this.
>>
>> I will have to report back when I get the tuned input board
> installed.
>>? I have a feeling it will be fixed and meet typical results.
>>
>> Remember I did use the tuned input board i built into the henry with
>> coax and it offered a full 30 DB improvement. I think it will be
>> better once the old input network is yanked out and this board is
>> feeding the tube directly with a cap.
>>
>> Side note, I have not heard of anyone complaining about image sizes
> it
>> more than 15 years.
>>
>> C
>>
>>
>> Links:
>> ------
>> [1] /g/ham-amplifiers/message/40111
>> [2] /mt/103425499/8135091
>> [3] /g/ham-amplifiers/post
>> [4] /g/ham-amplifiers/editsub/8135091
>> [5]
>>
>
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
> [1]
>
>
>
> Links:
> ------
> [1]
>
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
> [2] /g/ham-amplifiers/message/40113
> [3] /mt/103425499/8135091
> [4] /g/ham-amplifiers/post
> [5] /g/ham-amplifiers/editsub/8135091
|
Neat but not too keen on using vac relays for the coil tapping especially on the upper bands.
When you get into big power especially high duty cycle modes you need super robust components .
I see he has a 8020 . I owned a 8020,8021 and 8022 . I am
Still buddies with the man who designed most of each pa. Neat stuff but a major pain to maintain. One off parts which are very difficult to obtain. Sold it all when I bought my first house.
Bruce Gary at Gary engineering made some auto tune tube tetrode with handle pa’s. He sold them to guys in the Middle East. Unfortunately now silent key. Was a brilliant man. He fixed some botched tetrodes made by a guy in ca. if you go to his qrz page it has a pic of him rebuilding one for a guy in the Middle East.
I prefer simplicity and ccs duty cycle rating of a Pa.
I’d just use the vernier dials on the control box and have a chart for the rough setting on each band. I’m not a big fan of anything micro processor controlled. I was recently contacted by dx engineering to be a warranty repair center for acom and om power tube pa’s. So swamped with the other amps I thanked them and turned the offer down. Those pa’s are very complex.
Another issue with the 8k is all it can take is once or twice of adjusting the roller while the pa is keyed at mid or full output to do damage to the wheel and or inductor . The Rockwell pa’s tuned in steps . From a lower power level coarse tune to then higher which was the fine tune.
toggle quoted message
Show quoted text
On 2024-01-26 18:43, Peter Voelpel wrote: A friend of mine built that around a 4CX3000A and the same can be easily done to the 8K Ultra.
He made it semi automatic as the 8K and uses a variometer, switched anode capacitors and a 4000pf vacuum variable load cap..
Goal is full autotune.
Scroll on his qrz page down 3/4 of the page:
73
Peter, DJ7WW
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T02:22:44+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
My thoughts exactly
If I end up getting this parts 8k, I’ll keep the carcass and do the
following
Remove variable inductors and all fixed caps. Install a vac variable on
the plate and one on the load side. Use the current load cap motor to
turn the new load cap. Use the l1 coil motor to turn the new plate vac
variable. Both capacitors enough range to not need padding caps. Then
for the inductor a fixed coil and use the a similar flapper setup but
modified for more current to progressive short the coil which will be a
standard pi network.
Input would have fixed pi networks for each band.
Just an idea would be a long while before I would have time to do. Have
to complete the 3x6 and wrap up my 4x15 so can sell it.
I’ll be selling all the non needed 8k parts but won’t be cheap.
Lotta dead 8k ultras out there that need inductors. I have turned down
many in need of repair. Just cannot get the parts.
On 2024-01-26 18:10, Peter Voelpel wrote:
There are always other solutions possible.
A relay switched pi network with vacuum variables for instance.
There is no reason not to repair the amplifier if necessary.
I am sure you know that, with all the experience you are proud of.
73
Peter
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T01:01:32+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
So you have a source for the two roller inductors , and all associated
parts for them. You have the microy insulator used to mount the fixed
caps on the c1 and c2 side
Henry made the indictors at their factory they are un obtanium.
I’ve had 4 come in , mine had all the updates and was no different than
yours minus the input setup. I sold it as quick as I could after
verifying proper operation. Sorry but you just don’t have experience
with them as I do . And must not understand the issues that will occur
and why. That amp has to be one of the worst pa’s ever designed.
You will see
Scott
On 2024-01-26 16:25, W7WRX wrote:
There is nothing inside this thing I can't repair. It sounds like you
got a real hacked up amp. This one is as new with pretty much zero
hours on it.
C
-------------------------
From: [email protected] <[email protected]> on behalf of
Amp Guy Llc via groups.io <kb1sel@...>
Sent: Friday, January 26, 2024 4:23 PM
To: [email protected] <[email protected]>
Subject: Re: [ham-amplifiers] Tuned input
Wait till the other issues occur that I had described . I strongly
suggest selling it while it works
Scott
On 2024-01-26 16:06, W7WRX wrote:
I have compared the Tiny SA to my bench SA and its pretty close
really. There are a few youtube videos where they compare it to a real
SA and its limitations are shown. It is SUPER hand tool to have. I
use to for aligning radios, checking Xtals, oscillators and all sorts
of stuff.
Its $50 bucks. what do you expect.
Jim, My brother has the 4 inch version. I will ask him to bring it by
next time and will use it for comparison. I was going to order one but
really dont need it.
I ran the same test again after work. Using the method you described
with the Tiny SA. Only I used the Henry with 2000 carrier.
It shows best case -35 DB down for the second harmonic on 80 meters.
10 meters shows about the same.
I derailed the chain and manually adjusted the Loading inductor. It
has no effect on harmonics that I could find. It has a clear peak on
it, I tried 80, 15 and 10 meters. They all peaked the same spot so
that's good.
I then put the Two inductors to exactly henrys position via the guide
I posted from service manual. No improvement on harmonics. Only less
power output. My Friend told me at the factory they manually adjusted
that L for max output, hence He told me to do the same. My amp was
way out of time due to slipped collars and a derailed loading chain,
so I had to start over.
The henry is just dirty. Thats all there is to it. It has NO tuned
input, A shitty UNUN input mess and people just dealt with it. I bet
I am probably the only one to ever measure this.
I will have to report back when I get the tuned input board installed.
I have a feeling it will be fixed and meet typical results.
Remember I did use the tuned input board i built into the henry with
coax and it offered a full 30 DB improvement. I think it will be
better once the old input network is yanked out and this board is
feeding the tube directly with a cap.
Side note, I have not heard of anyone complaining about image sizes it
more than 15 years.
C
Links:
------
[1] /g/ham-amplifiers/message/40111
[2] /mt/103425499/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
Links:
------
[1]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[2] /g/ham-amplifiers/message/40113
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091 ?
?
|
A friend of mine built that around a 4CX3000A and the same can be easily done to the 8K Ultra. He made it semi automatic as the 8K and uses a variometer, switched anode capacitors and a 4000pf vacuum variable load cap.. Goal is full autotune. Scroll on his qrz page down 3/4 of the page: 73 Peter, DJ7WW -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] Tuned input Datum: 2024-01-27T02:22:44+0100 Von: "Amp Guy Llc" <kb1sel@...> An: " [email protected]" < [email protected]> My thoughts exactly If I end up getting this parts 8k, I’ll keep the carcass and do the following Remove variable inductors and all fixed caps. Install a vac variable on the plate and one on the load side. Use the current load cap motor to turn the new load cap. Use the l1 coil motor to turn the new plate vac variable. Both capacitors enough range to not need padding caps. Then for the inductor a fixed coil and use the a similar flapper setup but modified for more current to progressive short the coil which will be a standard pi network. Input would have fixed pi networks for each band. Just an idea would be a long while before I would have time to do. Have to complete the 3x6 and wrap up my 4x15 so can sell it. I’ll be selling all the non needed 8k parts but won’t be cheap. Lotta dead 8k ultras out there that need inductors. I have turned down many in need of repair. Just cannot get the parts. On 2024-01-26 18:10, Peter Voelpel wrote: There are always other solutions possible.
A relay switched pi network with vacuum variables for instance.
There is no reason not to repair the amplifier if necessary.
I am sure you know that, with all the experience you are proud of.
73
Peter
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T01:01:32+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
So you have a source for the two roller inductors , and all associated
parts for them. You have the microy insulator used to mount the fixed
caps on the c1 and c2 side
Henry made the indictors at their factory they are un obtanium.
I’ve had 4 come in , mine had all the updates and was no different than
yours minus the input setup. I sold it as quick as I could after
verifying proper operation. Sorry but you just don’t have experience
with them as I do . And must not understand the issues that will occur
and why. That amp has to be one of the worst pa’s ever designed.
You will see
Scott
On 2024-01-26 16:25, W7WRX wrote:
There is nothing inside this thing I can't repair. It sounds like you
got a real hacked up amp. This one is as new with pretty much zero
hours on it.
C
-------------------------
From: [email protected] <[email protected]> on behalf of
Amp Guy Llc via groups.io <kb1sel@...>
Sent: Friday, January 26, 2024 4:23 PM
To: [email protected] <[email protected]>
Subject: Re: [ham-amplifiers] Tuned input
Wait till the other issues occur that I had described . I strongly
suggest selling it while it works
Scott
On 2024-01-26 16:06, W7WRX wrote:
I have compared the Tiny SA to my bench SA and its pretty close
really. There are a few youtube videos where they compare it to a real
SA and its limitations are shown. It is SUPER hand tool to have. I
use to for aligning radios, checking Xtals, oscillators and all sorts
of stuff.
Its $50 bucks. what do you expect.
Jim, My brother has the 4 inch version. I will ask him to bring it by
next time and will use it for comparison. I was going to order one but
really dont need it.
I ran the same test again after work. Using the method you described
with the Tiny SA. Only I used the Henry with 2000 carrier.
It shows best case -35 DB down for the second harmonic on 80 meters.
10 meters shows about the same.
I derailed the chain and manually adjusted the Loading inductor. It
has no effect on harmonics that I could find. It has a clear peak on
it, I tried 80, 15 and 10 meters. They all peaked the same spot so
that's good.
I then put the Two inductors to exactly henrys position via the guide
I posted from service manual. No improvement on harmonics. Only less
power output. My Friend told me at the factory they manually adjusted
that L for max output, hence He told me to do the same. My amp was
way out of time due to slipped collars and a derailed loading chain,
so I had to start over.
The henry is just dirty. Thats all there is to it. It has NO tuned
input, A shitty UNUN input mess and people just dealt with it. I bet
I am probably the only one to ever measure this.
I will have to report back when I get the tuned input board installed.
I have a feeling it will be fixed and meet typical results.
Remember I did use the tuned input board i built into the henry with
coax and it offered a full 30 DB improvement. I think it will be
better once the old input network is yanked out and this board is
feeding the tube directly with a cap.
Side note, I have not heard of anyone complaining about image sizes it
more than 15 years.
C
Links:
------
[1] /g/ham-amplifiers/message/40111
[2] /mt/103425499/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
Links:
------
[1]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[2] /g/ham-amplifiers/message/40113
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091
?
?
|
My thoughts exactly
If I end up getting this parts 8k, I’ll keep the carcass and do the following
Remove variable inductors and all fixed caps. Install a vac variable on the plate and one on the load side. Use the current load cap motor to turn the new load cap. Use the l1 coil motor to turn the new plate vac variable. Both capacitors enough range to not need padding caps. Then for the inductor a fixed coil and use the a similar flapper setup but modified for more current to progressive short the coil which will be a standard pi network.
Input would have fixed pi networks for each band.
Just an idea would be a long while before I would have time to do. Have to complete the 3x6 and wrap up my 4x15 so can sell it.
I’ll be selling all the non needed 8k parts but won’t be cheap.
Lotta dead 8k ultras out there that need inductors. I have turned down many in need of repair. Just cannot get the parts.
toggle quoted message
Show quoted text
On 2024-01-26 18:10, Peter Voelpel wrote: There are always other solutions possible.
A relay switched pi network with vacuum variables for instance.
There is no reason not to repair the amplifier if necessary.
I am sure you know that, with all the experience you are proud of.
73
Peter
-----Original-Nachricht-----
Betreff: Re: [ham-amplifiers] Tuned input
Datum: 2024-01-27T01:01:32+0100
Von: "Amp Guy Llc" <kb1sel@...>
An: "[email protected]" <[email protected]>
So you have a source for the two roller inductors , and all associated
parts for them. You have the microy insulator used to mount the fixed
caps on the c1 and c2 side
Henry made the indictors at their factory they are un obtanium.
I’ve had 4 come in , mine had all the updates and was no different than
yours minus the input setup. I sold it as quick as I could after
verifying proper operation. Sorry but you just don’t have experience
with them as I do . And must not understand the issues that will occur
and why. That amp has to be one of the worst pa’s ever designed.
You will see
Scott
On 2024-01-26 16:25, W7WRX wrote:
There is nothing inside this thing I can't repair. It sounds like you
got a real hacked up amp. This one is as new with pretty much zero
hours on it.
C
-------------------------
From: [email protected] <[email protected]> on behalf of
Amp Guy Llc via groups.io <kb1sel@...>
Sent: Friday, January 26, 2024 4:23 PM
To: [email protected] <[email protected]>
Subject: Re: [ham-amplifiers] Tuned input
Wait till the other issues occur that I had described . I strongly
suggest selling it while it works
Scott
On 2024-01-26 16:06, W7WRX wrote:
I have compared the Tiny SA to my bench SA and its pretty close
really. There are a few youtube videos where they compare it to a real
SA and its limitations are shown. It is SUPER hand tool to have. I
use to for aligning radios, checking Xtals, oscillators and all sorts
of stuff.
Its $50 bucks. what do you expect.
Jim, My brother has the 4 inch version. I will ask him to bring it by
next time and will use it for comparison. I was going to order one but
really dont need it.
I ran the same test again after work. Using the method you described
with the Tiny SA. Only I used the Henry with 2000 carrier.
It shows best case -35 DB down for the second harmonic on 80 meters.
10 meters shows about the same.
I derailed the chain and manually adjusted the Loading inductor. It
has no effect on harmonics that I could find. It has a clear peak on
it, I tried 80, 15 and 10 meters. They all peaked the same spot so
that's good.
I then put the Two inductors to exactly henrys position via the guide
I posted from service manual. No improvement on harmonics. Only less
power output. My Friend told me at the factory they manually adjusted
that L for max output, hence He told me to do the same. My amp was
way out of time due to slipped collars and a derailed loading chain,
so I had to start over.
The henry is just dirty. Thats all there is to it. It has NO tuned
input, A shitty UNUN input mess and people just dealt with it. I bet
I am probably the only one to ever measure this.
I will have to report back when I get the tuned input board installed.
I have a feeling it will be fixed and meet typical results.
Remember I did use the tuned input board i built into the henry with
coax and it offered a full 30 DB improvement. I think it will be
better once the old input network is yanked out and this board is
feeding the tube directly with a cap.
Side note, I have not heard of anyone complaining about image sizes it
more than 15 years.
C
Links:
------
[1] /g/ham-amplifiers/message/40111
[2] /mt/103425499/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
Links:
------
[1]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[2] /g/ham-amplifiers/message/40113
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091 ?
|
There are always other solutions possible. A relay switched pi network with vacuum variables for instance. There is no reason not to repair the amplifier if necessary. I am sure you know that, with all the experience you are proud of. 73 Peter -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] Tuned input Datum: 2024-01-27T01:01:32+0100 Von: "Amp Guy Llc" <kb1sel@...> An: " [email protected]" < [email protected]> So you have a source for the two roller inductors , and all associated parts for them. You have the microy insulator used to mount the fixed caps on the c1 and c2 side Henry made the indictors at their factory they are un obtanium. I’ve had 4 come in , mine had all the updates and was no different than yours minus the input setup. I sold it as quick as I could after verifying proper operation. Sorry but you just don’t have experience with them as I do . And must not understand the issues that will occur and why. That amp has to be one of the worst pa’s ever designed. You will see Scott On 2024-01-26 16:25, W7WRX wrote: There is nothing inside this thing I can't repair. It sounds like you
got a real hacked up amp. This one is as new with pretty much zero
hours on it.
C
-------------------------
From: [email protected] <[email protected]> on behalf of
Amp Guy Llc via groups.io <kb1sel@...>
Sent: Friday, January 26, 2024 4:23 PM
To: [email protected] <[email protected]>
Subject: Re: [ham-amplifiers] Tuned input
Wait till the other issues occur that I had described . I strongly
suggest selling it while it works
Scott
On 2024-01-26 16:06, W7WRX wrote:
I have compared the Tiny SA to my bench SA and its pretty close
really. There are a few youtube videos where they compare it to a real
SA and its limitations are shown. It is SUPER hand tool to have. I
use to for aligning radios, checking Xtals, oscillators and all sorts
of stuff.
Its $50 bucks. what do you expect.
Jim, My brother has the 4 inch version. I will ask him to bring it by
next time and will use it for comparison. I was going to order one but
really dont need it.
I ran the same test again after work. Using the method you described
with the Tiny SA. Only I used the Henry with 2000 carrier.
It shows best case -35 DB down for the second harmonic on 80 meters.
10 meters shows about the same.
I derailed the chain and manually adjusted the Loading inductor. It
has no effect on harmonics that I could find. It has a clear peak on
it, I tried 80, 15 and 10 meters. They all peaked the same spot so
that's good.
I then put the Two inductors to exactly henrys position via the guide
I posted from service manual. No improvement on harmonics. Only less
power output. My Friend told me at the factory they manually adjusted
that L for max output, hence He told me to do the same. My amp was
way out of time due to slipped collars and a derailed loading chain,
so I had to start over.
The henry is just dirty. Thats all there is to it. It has NO tuned
input, A shitty UNUN input mess and people just dealt with it. I bet
I am probably the only one to ever measure this.
I will have to report back when I get the tuned input board installed.
I have a feeling it will be fixed and meet typical results.
Remember I did use the tuned input board i built into the henry with
coax and it offered a full 30 DB improvement. I think it will be
better once the old input network is yanked out and this board is
feeding the tube directly with a cap.
Side note, I have not heard of anyone complaining about image sizes it
more than 15 years.
C
Links:
------
[1] /g/ham-amplifiers/message/40111
[2] /mt/103425499/8135091
[3] /g/ham-amplifiers/post
[4] /g/ham-amplifiers/editsub/8135091
[5]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[1]
Links:
------
[1]
/g/ham-amplifiers/leave/12941173/8135091/773995006/xyzzy
[2] /g/ham-amplifiers/message/40113
[3] /mt/103425499/8135091
[4] /g/ham-amplifiers/post
[5] /g/ham-amplifiers/editsub/8135091 ?
|
