Re: Gonset 201 mk3 80-10 amp. ( hv tranny needed )
I wonder if there are any shops that would rewind it? Bob W4JFA?
Hi Don.? I wonder if you ever located one of these transformers.? I had one of those amps about 50 years ago and used it for years.? I see that Hammond Manufacturing, who bought out the Peter Dahl line, has the transformer in stock.? You can check their website and look at the Gonset listings to find it.? No idea what the price is, but the specs are all there.? Good luck!
73, Floyd - K8AC
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Re: Looking for data on an Eimax Y-685A
Reid, thank you very much for looking that up. The info is greatly appreciated!
Fortunately I still have the intact device that it was in, it was fully functional. The MCL 15222 generator achieves 100 watts... which is curious because the datasheet for the 8906 rates it at only 10 watts plate dissipation and 30 watts output!
I assume the rather large non-standard heatsink has a lot to do with that difference.
I shall do some more research and proceed with caution, thank you.
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Re: Gonset 201 mk3 80-10 amp. ( hv tranny needed )
Hi Don.? I wonder if you ever located one of these transformers.? I had one of those amps about 50 years ago and used it for years.? I see that Hammond Manufacturing, who bought out the Peter Dahl line, has the transformer in stock.? You can check their website and look at the Gonset listings to find it.? No idea what the price is, but the specs are all there.? Good luck!
73, Floyd - K8AC
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Re: Looking for data on an Eimax Y-685A
Eimac history shows: 03/73 Y685A is an 8906XAL special, for MCL generator"
the -AL suffix indicated a tube made for the Airlines, they used a lot of planar triodes in the past for short range navigation equipment.
For electrical specs look up 8906.?
the time and energy required to build a 23cm cavity would be wasted if the tube was weak, or if you don't have a source for a spare.
GL with the search.?
Reid W6MTF
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Dear Alek,
Thank you for the kind words.
Hal
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Yeah, thanks Hal. You're a man after my own heart.
I have been fortunate to be able to help others in a similar way over the years and I've also been on the receiving end many times. I've met a lot of nice people that way.
Any relation to guitarist Harvey Mandel?
73, Alek. VK6APK
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On 16/08/2023 11:45 pm, HaL Mandel wrote: Dear Alek,
Read your quest for the power meter manual, and herein certainly wish you
success.
Some chap wrote me the other day, looking for the manual for a 10KW
ATU that was only manufactured for a few months many years ago.
He saw a picture of one in my science trailer on some such Internet URL
and took the effort to find my address. Yes, I had a manual and I got a copy
to him for nothing. In color, blah, blah. I was so glad to help someone, and
if I had this manual you are looking for I would get a copy to you, directly.
Fondly,
Hal Mandel
W4HBM
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Not quite.? ?It's a water cooled tube, not vapour phase cooled.? ?Air cooling is good for 50 watts per sq CM of internal anode area.? ?Vapour phase cooling is good for 135 watts of internal anode area. Water cooling is good for 1000 watts of internal anode area.?
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Jim,
?
It¡¯s like having an Alpha Stanley Steamer on the bench.
?
Gurgle, gurgle.
?
Hal Mandel
W4HBM
?
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From: [email protected] < [email protected]>
On Behalf Of Jim VE7RF
Sent: Wednesday, August 16, 2023 12:16 PM
To: [email protected]
Subject: Re: [ham-amplifiers] Eimac YU-191B
?
The YU-106 appears to be a just 3-4 wraps of 3/8"? copper tubing wrapped around the anode.?
The YU-191B? is the real deal, with the coffee can around the anode.... just like all the other water cooled tubes.??
2-3 years ago, several appeared on the used market..... and several? hb HF amps were built using them.? ?I forget what the required water flow rates were.? The folks were using distilled water, external pump, external air cooled radiator ( shrouded between
fan and radiator), and once they got the cooling optimized, the amps worked very well.??
?
The beauty was...... there was no noise, nor heat in the shack.? Some of the folks had the hot air from the? radiator exhaust? routed to the outside in hot wx.? ?And routed to the inside in winter.? ?As long as no leaks anywhere, and safety interlocks used,
it works fine.? ?IE: with loss of water flow, reduced water flow, water too hot entering the tube, everything shuts down asap, including opening off key line, and shutting the fil off.
?
Note forced air is still required to cool the fil.? 7.5 vac @ 50 amps =? 375 watts.?
?
It's a superb tube....and afaik, it's still rebuildable per Econco. .?
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Looking for data on an Eimax Y-685A
edit: obviously I'm an idiot and didn't realize the typo in the title... Eimac not Eimax... ? Hi all, wondering if anyone has any data on this tube? Potential candidate for a 23cm amp. This came out of a resonant cavity in a 100watt signal generator (this specific module was good for 400-1000MHz). Can't find any data on it, looks similar to a Y-503 but not quite. Have searched through a bunch of Eimac catalogs and found similar planar triodes but not this one. Would like to have some concrete data. Anyone familiar with this? Thanks! 73   
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The YU-106 appears to be a just 3-4 wraps of 3/8"? copper tubing wrapped around the anode.?
The YU-191B? is the real deal, with the coffee can around the anode.... just like all the other water cooled tubes.??
2-3 years ago, several appeared on the used market..... and several? hb HF amps were built using them.? ?I forget what the required water flow rates were.? The folks were using distilled water, external pump, external air cooled radiator ( shrouded between fan and radiator), and once they got the cooling optimized, the amps worked very well.??
?
The beauty was...... there was no noise, nor heat in the shack.? Some of the folks had the hot air from the? radiator exhaust? routed to the outside in hot wx.? ?And routed to the inside in winter.? ?As long as no leaks anywhere, and safety interlocks used, it works fine.? ?IE: with loss of water flow, reduced water flow, water too hot entering the tube, everything shuts down asap, including opening off key line, and shutting the fil off.
?
Note forced air is still required to cool the fil.? 7.5 vac @ 50 amps =? 375 watts.?
?
It's a superb tube....and afaik, it's still rebuildable per Econco. .?
|
Dear Alek,
Read your quest for the power meter manual, and herein certainly wish you
success.
Some chap wrote me the other day, looking for the manual for a 10KW
ATU that was only manufactured for a few months many years ago.
He saw a picture of one in my science trailer on some such Internet URL
and took the effort to find my address. Yes, I had a manual and I got a copy
to him for nothing. In color, blah, blah. I was so glad to help someone, and
if I had this manual you are looking for I would get a copy to you, directly.
Fondly,
Hal Mandel
W4HBM
|
This is a really long shot.
I am looking for a user manual and more importantly, a schematic for a "Agikawa APM-1H" automatic SWR and peak reading power meter, 1-8 ~ 60MHz.
One is pictured here.
It looks exactly the same as the Macaw PRM-1, for which I have the manual and schemnatic but the active circuitry inside is completely different.
Searches via Google and BAMA have drawn a blank, so I'm hoping somebody might have owned one in the past and still knows where to find the documentation.
I have changed the 2 ICs and 4 transistors. All the diodes check out fine as well but the fault persists. When switched to "PEP", the meter pins on 200W scale and shows around 400W on the 1000W and 2000W scales, without anything being connected to the device.
I would really appreciated any leads, so I can repair it and pass it on to a friend who is getting back into the hobby after many years away.
Thanks and 73, Alek VK6APK.
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While working at Eimac San Carlos I wasn't involved with the Salt Lake City products but I have product announcements for both sites.
"Oct 1989. The YU-191B was a version of the YU106 a water cooled 3CX3000A7, with a special water jacket for Ehrhorn"
A YU-191B should perform exactly the same as a 3000A7 except needing a flow of water thru the anode cooler to keep it from melting down.?
Reid? W6MTF
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Hey Bob ¨C I knew the 3CX1200s were tough little bastards, but I never knew they glowed as bright as that ! Very cool ! ?
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From: [email protected] <[email protected]> On Behalf Of Robert W5AJ
Sent: Friday, August 11, 2023 6:25 AM
To: [email protected]
Subject: [ham-amplifiers] 3CX1200 photo? working on AL-1200 today.?? (the HV is off folks)?? Testing filament / blower settings.??? Photo attached of tube with blower/filament on.?? 73
If photo doesn't go through, it's on google photos
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?I have seen some inexpensive sorce? ebay£¨$220/ea), it? is seems a water cooled version of 3CX3000A7 but more power(driving power 535W and 8350W out put) ? ? ? Hsu
|
working on AL-1200 today.?? (the HV is off folks)?? Testing filament / blower settings.??? Photo attached of tube with blower/filament on.?? 73
If photo doesn't go through, it's on google photos
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Re: Heathkit SB-220 Electronic Bias
I like the bias boards
?I have them in use all over for years. I remote the pot to adjust rhe bias where I ever I want it.? I run 6000 volts on a pair of 3-1000z tubes.? But sometimes I run 4000 volts. So it's nice to adjust it.
?I have had one fail.? I put an unknown tube in the amp, hit the b plus. The tube flashed and it zapped the transistor. I tossed a new one in, they are 2 bucks and it was back running.? ?
C
The W4ZT board was designed for the Russian tubes. ?It¡¯s great for that. ?IMHO it¡¯s not needed or wanted bd side I agree with Jim come glitch time kiss it bye-bye.
On Thursday, August 10, 2023, 12:24 PM, Jim VE7RF <jim.thom@...> wrote:
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The problem with the adjustable W4ZT bias setup is..... come glitch time,? I can tell you exactly which components will fail.
?
A simple string of 6A10's....or? 10A10's is dead nuts simple.? ?Use the constant current graph to determine required number of diodes for a required idle current.? Then test, then tap more or less diodes for an exact idle current.?
Then install a? SPDT mini? toggle on the rear apron, to tap even more diodes in the circuit.? ?Then you can have a choice of 2 x idle current settings, one for SSB and one for CW.
On any GG high mu triode amp, you can't bias to cutoff on CW...... or you will get key clix.? ? For cw use, idle current is set to 10-40 ma.? ?On? SSB,? you can reduce the idle current by a bunch.? 180 ma on a SB-220? ( and a whopping 220-230 ma on my drake
L4B amps is nuts.? ?I use? 10 x 6A10 diodes on the drake amps.? Then 100 ma idle on 2650 vdc position..and just 40 ma idle on 1900 vdc position.? IMD is superb with 1290 watts pep out in 2650 vdc position.? IMD is superb with 625 watts pep out in the 1900
vdc position.?
Come glitch time, you won't be blowing up a string of diodes..with their 400 amp surge rating.? You won't blow em up in normal operation with their? 6/10 amp? cccs rating either.?
On the drake amps,? I used a miniature DPDT-center OFF? toggle on rear apron.? In center OFF position, ALL 10 diodes are in the circuit...( or max number of diodes you want used in a given string).? The other 2 x positions provide for 2 x taps on the string..for
a total of 3 x bias positions.? Easy peasy.? ?I wired both poles of the DPDT-center off mini toggle in parallel.
?
On that 3x6? HF amp, I had him use a 20 position HD rotary switch. I was a? double wafer unit, so wired both wafers in parallel.? ?Left the 1st 10 x diodes always in the circuit, then tapped off every 2nd or 3rd diode after that with the rotary switch.?
The you can fully adjust the bias...on the fly, in mid sentence.? ?Cool, cuz then it can be biased to class B / C? for FM use. or a bit more idle for CW use, or more for SSB use.? ?He had the 20 position switch in the junk box..so used it.? Garden variety
12 position rotary switches are cheap, new.? ?You can also use 2 x? 12 position rotary switches in series....with position #12 of the 1st switch, feeding the input of the 2nd switch, to obtain a total of 23 positions of bias.
?
For extreme hardcore use, a spst mini toggle can also be used in conjunction with the rotary switch, to tap just the very last diode, for ultra fine adjustment. For 100%? bias regulation, wire a big value lytic across the entire string of diodes. When sucking
more current, the V drop will increase by 10%.? IE: 7 vdc to 7.7 vdc.? With the lytic across em all,? you don't get the increase.? It does not budge.?
?
For really big tubes, diodes? can be wired in parallel for more current...and yes, the current will split 50-50....and also 33.33? - 33.33? - 33.33??
?
I tried EBS? in both dual state...and also tri-state.? None of em are fast enough to cut off the tubes? between syllables on ssb.? ?EBS only works if using PTT ssb.? ?EBS only works on VOX? SSB, between last word spoken...and whn VOX delay times out.?
For qsk CW use, just reduce the idle current to 10-25 ma. ..and ditto with semi break in CW.?
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Re: Heathkit SB-220 Electronic Bias
The W4ZT board was designed for the Russian tubes. ?It¡¯s great for that. ?IMHO it¡¯s not needed or wanted bd side I agree with Jim come glitch time kiss it bye-bye.
On Thursday, August 10, 2023, 12:24 PM, Jim VE7RF <jim.thom@...> wrote: The problem with the adjustable W4ZT bias setup is..... come glitch time,? I can tell you exactly which components will fail.
?
A simple string of 6A10's....or? 10A10's is dead nuts simple.? ?Use the constant current graph to determine required number of diodes for a required idle current.? Then test, then tap more or less diodes for an exact idle current.?
Then install a? SPDT mini? toggle on the rear apron, to tap even more diodes in the circuit.? ?Then you can have a choice of 2 x idle current settings, one for SSB and one for CW.
On any GG high mu triode amp, you can't bias to cutoff on CW...... or you will get key clix.? ? For cw use, idle current is set to 10-40 ma.? ?On? SSB,? you can reduce the idle current by a bunch.? 180 ma on a SB-220? ( and a whopping 220-230 ma on my drake L4B amps is nuts.? ?I use? 10 x 6A10 diodes on the drake amps.? Then 100 ma idle on 2650 vdc position..and just 40 ma idle on 1900 vdc position.? IMD is superb with 1290 watts pep out in 2650 vdc position.? IMD is superb with 625 watts pep out in the 1900 vdc position.?
Come glitch time, you won't be blowing up a string of diodes..with their 400 amp surge rating.? You won't blow em up in normal operation with their? 6/10 amp? cccs rating either.?
On the drake amps,? I used a miniature DPDT-center OFF? toggle on rear apron.? In center OFF position, ALL 10 diodes are in the circuit...( or max number of diodes you want used in a given string).? The other 2 x positions provide for 2 x taps on the string..for a total of 3 x bias positions.? Easy peasy.? ?I wired both poles of the DPDT-center off mini toggle in parallel.
?
On that 3x6? HF amp, I had him use a 20 position HD rotary switch. I was a? double wafer unit, so wired both wafers in parallel.? ?Left the 1st 10 x diodes always in the circuit, then tapped off every 2nd or 3rd diode after that with the rotary switch.? The you can fully adjust the bias...on the fly, in mid sentence.? ?Cool, cuz then it can be biased to class B / C? for FM use. or a bit more idle for CW use, or more for SSB use.? ?He had the 20 position switch in the junk box..so used it.? Garden variety 12 position rotary switches are cheap, new.? ?You can also use 2 x? 12 position rotary switches in series....with position #12 of the 1st switch, feeding the input of the 2nd switch, to obtain a total of 23 positions of bias.
?
For extreme hardcore use, a spst mini toggle can also be used in conjunction with the rotary switch, to tap just the very last diode, for ultra fine adjustment. For 100%? bias regulation, wire a big value lytic across the entire string of diodes. When sucking more current, the V drop will increase by 10%.? IE: 7 vdc to 7.7 vdc.? With the lytic across em all,? you don't get the increase.? It does not budge.?
?
For really big tubes, diodes? can be wired in parallel for more current...and yes, the current will split 50-50....and also 33.33? - 33.33? - 33.33??
?
I tried EBS? in both dual state...and also tri-state.? None of em are fast enough to cut off the tubes? between syllables on ssb.? ?EBS only works if using PTT ssb.? ?EBS only works on VOX? SSB, between last word spoken...and whn VOX delay times out.?
For qsk CW use, just reduce the idle current to 10-25 ma. ..and ditto with semi break in CW.?
|
Re: Heathkit SB-220 Electronic Bias
Dear Adrian, VK4TUX,
?
Thank you for your reply to the topic raised yesterday.
(Electronic Bias / SB-220 / Advice)
?
The references you sent are exactly what is available on-line for the
W4ZT board.
?
Unfortunately, there is a divergence of opinion as to what¡¯s ¡°hidden below.¡±
?
In tracing out the Bias Circuit on the ¡®220 schematic, it is apparent that the
W4ZT board is NOT a simple replacement for the Zener diode, meaning the red
and black wires just do NOT plug into the diamond-shaped blocks on the
¡®220 schematic, and that there is a need for an updated connection understanding
as to what goes on in the amplifier when the Zener is clipped and the New El. Bias Bd is installed, and I just don¡¯t have the horsepower to say, ¡°Yo! All this goes here!¡±
?
Hal
W4HBM
?
?
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From: [email protected] < [email protected]>
On Behalf Of Adrian Fewster
Sent: Wednesday, August 9, 2023 10:16 PM
To: [email protected]
Subject: Re: [ham-amplifiers] Heathkit SB-220 Electronic Bias
?
This is useful to show the B- end connection to get connection 'polarity' correct ;
?
Popular with AM sb-220 users for the 20v easily set bias. and 5 - 6v for ssb.
?
73
?
vk4tux
?
On 10/8/23 10:45, HaL Mandel wrote:
Gentlemen,
Some years back, Tony King, W4ZT {SK} designed and sold a small board with a blck wire and a red wire
called the Electronic Bias Board.
Does anyone remember how to modify the '220 in order to accommodate this little invention?
I've looked and looked at the factory schematic and have not been able to reinvent that wheel.
I appreciate all your help.
Fondly,,
Hal Mandel, W4HBM
<w4hbm@...>
|
Re: Heathkit SB-220 Electronic Bias
Dear Mike,
?
I saw this photo during my exhausting run of trying to find out what¡¯s
under the hood.
?
Yes, the Black and Red wire are sure visible.
?
For me, though, it left questions unanswered, like ¡°What does the +120VDC
go to?¡± And, ¡°What about the open frame relay and its friendly 100K-Ohm
°ù±ð²õ¾±²õ³Ù´Ç°ù-²ú³Ü»å»å²â?¡±
?
The very last thing I need to do is to fry a set of Eimacs because of stupidity.
?
So I needed to keep looking.
?
All the comments and advice hereon is SO welcome: Thank You All.
?
Hal
W4HBM
?
?
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From: [email protected] < [email protected]>
On Behalf Of mfle2001
Sent: Wednesday, August 9, 2023 9:49 PM
To: [email protected]
Subject: Re: [ham-amplifiers] Heathkit SB-220 Electronic Bias
?
There is a pic of it in an SB220 on
It simply replaces the bias zener diode.
I think its a complicated solution for a non problem, but I might be persuaded otherwise!
?
73
Mike
VK2AMF.
At 10:45 AM 10/08/2023, you wrote:
Gentlemen,
Some years back, Tony King, W4ZT {SK} designed and sold a small board with a blck wire and a red wire
called the Electronic Bias Board.
Does anyone remember how to modify the '220 in order to accommodate this little invention?
I've looked and looked at the factory schematic and have not been able to reinvent that wheel.
I appreciate all your help.
Fondly,,
Hal Mandel, W4HBM
<w4hbm@...>
Mike Fleetwood
Canberra Australia and Sidcup UK.
Worldwide email address is:????? mfleetwood@...
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Bob
Floyd - K8AC
Brandon DX
HaL Mandel
Robert, W5AJ
