If you go to the MFJ Enterprises website, you will see a news message from them explaining the situation. ? They say they are working on being able to select and order parts, etc. from the site.? It is a whole new website.? Right now you can only order by phone.? Take a look at the message when you bring up the site: ?
Lou WA5LOU On Fri, May 8, 2020 at 10:11 PM Alek Petkovic < vk6apk@...> wrote: G'day all.
My AL-1500 blower is getting pretty noisy and tired and I'm looking to
replace it.
I have looked at the Ameritron/MFJ wenbsite and I cannot, for the life
of me, find a link where I can purchase spare parts.
I have bought spare parts from Ameritron in the past and don't remeber
having any difficulty in finding my way around the website. They have
obviously changed the website and unfortunately made it impossible for
me to find things now.
That's progress, I guess.
I am in Australia, so I don't particularly ring the US.
Is anybody able to shed some light on how I maight place an order from
that company?
Thanks and 73, Alek, VK6APK.
--
|
G'day all.
My AL-1500 blower is getting pretty noisy and tired and I'm looking to replace it.
I have looked at the Ameritron/MFJ wenbsite and I cannot, for the life of me, find a link where I can purchase spare parts.
I have bought spare parts from Ameritron in the past and don't remeber having any difficulty in finding my way around the website. They have obviously changed the website and unfortunately made it impossible for me to find things now.
That's progress, I guess.
I am in Australia, so I don't particularly ring the US.
Is anybody able to shed some light on how I maight place an order from that company?
Thanks and 73, Alek, VK6APK.
|
The input swr of the FL2100 differs from
the swr at the tuner respectively the antenna.
?
73
Peter
?
?
My fl2100z seems to work perfectly but for one curious thing.
Tune the rig to the antenna using a manual tuner (palstar) with amp either off
or on v low power.? See see of c1:1
Tune up amp normally
Run qro and the rig now shows swr of c 2:1.
Turn ampmoff...swr back down.? Amp on, swr back up
Why?
--
David G4YVM
|
What are you loading up to?? An antenna or a dummy load.? Do you have an antenna tuner?
Lou WA5LOU
On Thu, Apr 30, 2020 at 3:53 AM David Perry < bumbledp@...> wrote: My fl2100z seems to work perfectly but for one curious thing.
Tune the rig to the antenna using a manual tuner (palstar) with amp either off or on v low power.? See see of c1:1
Tune up amp normally
Run qro and the rig now shows swr of c 2:1.
Turn ampmoff...swr back down.? Amp on, swr back up
Why?
--
David G4YVM
|
Ps the swr on the amp meter always stays low
|
My fl2100z seems to work perfectly but for one curious thing.
Tune the rig to the antenna using a manual tuner (palstar) with amp either off or on v low power.? See see of c1:1
Tune up amp normally
Run qro and the rig now shows swr of c 2:1.
Turn ampmoff...swr back down.? Amp on, swr back up
Why?
--
David G4YVM
|
Re: Array solution BPF-6 with an Dentron amp
Far Circuits has a bare board to build a tuned input for the GLA-1000, it might also be adaptable to the Clipperton-L. You supply the parts of course.
73,Chuck
N0NC
|
Re: Array solution BPF-6 with an Dentron amp
Band? pass? filters? will? do....? nothing.? ?BP? filters? are? 50? ohms? at? each? end.?
PI nets? are LP? filters....? which? is? want u? want for? tuned? inputs.....? +? match? tube Z .??
An? external? auto? tuner...with? loads? of? pre-sets? would? work? good.
Jim? ?VE7RF??
|
Array solution BPF-6 with an Dentron amp
Hey guys:
With all the "shelter in place" I am off work, so I have time to play in the shack.......
Here is the question.... Has anyone used or modified for use an "ARRAY SOLUTIONS BPF-6" to use as a tuned input for either a Dentron GLA-1000 (AMP SUPPLY LA-1000), or a Dentron CLIPPERTON-L?
I own both amps, and neither has a tuned input. I am trying to eliminate the manual tuner in front of the amp. On the AMP SUPPLY, I have tried an older LDG AT11MP, it (for some reason) will not reliably find a match on 75 phone. LDG had told me years ago that due to the age, some parts are unavailable, and they cant help me. I have checked all the hardware, and it is tight, therefore that appears to be a no go
Anyone with any good ideas ?
de Howard, N9KTW?
|
Re: Plate blocking caps YC156
Hi Dave,
???? Glad you mentioned about the KVI type russian doorknobs as supplies are still around and I did get a few through the post recently. Also K15-5 type 6.3kV ceramics (proof tested to 9kV so ufb for some jobs) for some other purposes around the tubes and PSU. High KVAR ratings still attract a good price and of course they're a good size too, but worth snapping a pair up before they're all gone. Was going to mention it last night, but as it's my first post was rather hesitant, however I've broke the duck now.
There is some data around very well worth a search for on them.
73 All, reading the thread with interest (am still building and fixing tube amps)
Adam G0ORY
On Sun, Mar 22, 2020 at 1:32 PM DAVE WHITE via Groups.Io <mausoptik= [email protected]> wrote:
Hi Tracey - I used one of these in my 3CX3000 amp
Mine's a 2000pF rated at 20kV.? I have seen them on Ebay for about a tenner - a lot cheaper than the ceramic one you were looking at which I think was ?50.? I'd bought the big ceramic caps in the past off Mr Jandek at Friedrichshafen (a big stand in the fleamarket with Russian vacuum capacitors etc, usually on the back wall - remember him?)? for about 10 euros.? He wasn't there last year (and who knows what will happen this year?)? but he might still be in business.? He was based in Bielefeld last I heard.
I can only state (rather unscientifically) that I haven't blown it up yet.? ?I also use one of the plastic LCC caps as a matching series capacitor on my ground-level fed 3/8 wave wibbly-wonky-sort-of-inverted-L on 160m.? ?The only time I damaged that was when I inadvertently reversed the Land Rover over the feedpoint.? I can't blame RF current for that, only clumsy driving.
Something similar
Alternatively how about getting in touch with Alex UR4LL?? He's a thoroughly reliable chap and will almost certainly have a Russian made equivalent of the ceramic capacitors you mentioned - at a pretty good price from what I remember.
Hope that helps
73
Dave G0OIL
On Saturday, 21 March 2020, 23:04:52 GMT, Tracey Gardner via Groups.Io <tracey.gardner= [email protected]> wrote:
?
Having looked at the Draloric data sheet for the 2500pf, R85, PE 200, 14kvp Ceramic Disc Capacitor, it looks like it is rated at 60 amps RMS
?
Tracey G5VU
?
----- Original Message -----
From: Tracey Gardner via Groups.Io <tracey.gardner@...>
Sent: 21/03/2020 15:22:49
Subject: [ham-amplifiers] Plate blocking caps YC156
A number of high voltage/current rating ceramic capacitors??have just come up on eBay in the UK.
It looks like they have come out of some kind of RF heating or medical equipment.
I'd be grateful for any thoughts as to their suitability for use as the plate blocking capacitors for a YC156 amp.
The description and eBay item numbers are as follows
Draloric, 2500pf, PE 200, 14kvp Ceramic Disc Capacitor: Item Number 114153436756
Unilator Type 860, 15kv 2000pf, Capacitor: eBay item number:114154806911
Unilator Type 807, 14kv 2000pf Ceramic Disc Capacitor: eBay item number:114154801609
Unilator Type 910, 15kv 1000pf Ceramic Disc Capacitor: eBay item number:114154801080
Many thanks
?
Tracey G5VU
?
----- Original Message ----- From: Jim VE7RF <jim.thom@...> Reply-To: < [email protected]> To: < [email protected]> Sent: 29/12/2019 15:12:42 Subject: Re: [ham-amplifiers] Plate blocking caps YC156 The??problem??with??broadcast?? mica's (or??any??mica)??is??they??won't handle?? any current??on??higher??freqs.??But??they are??NPO.?? Drake used switchable mica's??in their??MN-2000??ant??tuner (along??with??2 x air??variables).?? Drake??used??7 (SEVEN)?? mica's??in??parallel....just??for 10m??band.....just to handle 1200w??pep into??some??swr.?? Drake??used??a single??700 pf??(NPO) mica??to??pad??the 1600??pf??load??cap on??80m band....??on their L4B??80-10??amp. Those CDE and??similar??mica??caps??are??typ rated??at?? 1??mhz??for??max current.??> 6??mhz, they??have??fallen??off really??fast.??>20??mhz,??they??are??down??to??nothing. Mica's??work??superb??on??low??bands (<6 mhz)....??and ceramic??caps work??superb??>2-3 mhz. For??a plate??block??cap, ceramic??is??used,??since??we??require??a cap(s) that??will??handle loads??of??current on??21-29.7??mhz. (+6M).????On lower??bands,??plate??block??cap??current??drops??way??off.....non??issue. HEC??is??still made??in PA...amish??country.?? Download??the??main??catalog for??CERAMIC???? Draloric is??still??made in??germany. Centralab??was??bought??out??by??ITT-Jennings.??Centralab??(ITT-Jennings)????857 /??859??is??the??same??as a HEC?? HT-57??/??HT-59 Everything??else??is??a chinese copy.?? Also??factor??in??the??heat??from??the??anode??will??travel??down??the strap..to??one??side??of??plate block??caps. Jim?? VE7RF
|
Re: Plate blocking caps YC156
Hi Tracey - I used one of these in my 3CX3000 amp
Mine's a 2000pF rated at 20kV.? I have seen them on Ebay for about a tenner - a lot cheaper than the ceramic one you were looking at which I think was ?50.? I'd bought the big ceramic caps in the past off Mr Jandek at Friedrichshafen (a big stand in the fleamarket with Russian vacuum capacitors etc, usually on the back wall - remember him?)? for about 10 euros.? He wasn't there last year (and who knows what will happen this year?)? but he might still be in business.? He was based in Bielefeld last I heard.
I can only state (rather unscientifically) that I haven't blown it up yet.? ?I also use one of the plastic LCC caps as a matching series capacitor on my ground-level fed 3/8 wave wibbly-wonky-sort-of-inverted-L on 160m.? ?The only time I damaged that was when I inadvertently reversed the Land Rover over the feedpoint.? I can't blame RF current for that, only clumsy driving.
Something similar
Alternatively how about getting in touch with Alex UR4LL?? He's a thoroughly reliable chap and will almost certainly have a Russian made equivalent of the ceramic capacitors you mentioned - at a pretty good price from what I remember.
Hope that helps
73
Dave G0OIL
On Saturday, 21 March 2020, 23:04:52 GMT, Tracey Gardner via Groups.Io <tracey.gardner@...> wrote:
?
Having looked at the Draloric data sheet for the 2500pf, R85, PE 200, 14kvp Ceramic Disc Capacitor, it looks like it is rated at 60 amps RMS
?
Tracey G5VU
?
----- Original Message -----
From: Tracey Gardner via Groups.Io <tracey.gardner@...>
Sent: 21/03/2020 15:22:49
Subject: [ham-amplifiers] Plate blocking caps YC156
A number of high voltage/current rating ceramic capacitors??have just come up on eBay in the UK.
It looks like they have come out of some kind of RF heating or medical equipment.
I'd be grateful for any thoughts as to their suitability for use as the plate blocking capacitors for a YC156 amp.
The description and eBay item numbers are as follows
Draloric, 2500pf, PE 200, 14kvp Ceramic Disc Capacitor: Item Number 114153436756
Unilator Type 860, 15kv 2000pf, Capacitor: eBay item number:114154806911
Unilator Type 807, 14kv 2000pf Ceramic Disc Capacitor: eBay item number:114154801609
Unilator Type 910, 15kv 1000pf Ceramic Disc Capacitor: eBay item number:114154801080
Many thanks
?
Tracey G5VU
?
----- Original Message ----- From: Jim VE7RF <jim.thom@...> Reply-To: < [email protected]> To: < [email protected]> Sent: 29/12/2019 15:12:42 Subject: Re: [ham-amplifiers] Plate blocking caps YC156 The??problem??with??broadcast?? mica's (or??any??mica)??is??they??won't handle?? any current??on??higher??freqs.??But??they are??NPO.?? Drake used switchable mica's??in their??MN-2000??ant??tuner (along??with??2 x air??variables).?? Drake??used??7 (SEVEN)?? mica's??in??parallel....just??for 10m??band.....just to handle 1200w??pep into??some??swr.?? Drake??used??a single??700 pf??(NPO) mica??to??pad??the 1600??pf??load??cap on??80m band....??on their L4B??80-10??amp. Those CDE and??similar??mica??caps??are??typ rated??at?? 1??mhz??for??max current.??> 6??mhz, they??have??fallen??off really??fast.??>20??mhz,??they??are??down??to??nothing. Mica's??work??superb??on??low??bands (<6 mhz)....??and ceramic??caps work??superb??>2-3 mhz. For??a plate??block??cap, ceramic??is??used,??since??we??require??a cap(s) that??will??handle loads??of??current on??21-29.7??mhz. (+6M).????On lower??bands,??plate??block??cap??current??drops??way??off.....non??issue. HEC??is??still made??in PA...amish??country.?? Download??the??main??catalog for??CERAMIC???? Draloric is??still??made in??germany. Centralab??was??bought??out??by??ITT-Jennings.??Centralab??(ITT-Jennings)????857 /??859??is??the??same??as a HEC?? HT-57??/??HT-59 Everything??else??is??a chinese copy.?? Also??factor??in??the??heat??from??the??anode??will??travel??down??the strap..to??one??side??of??plate block??caps. Jim?? VE7RF
|
Re: Plate blocking caps YC156
?
Having looked at the Draloric data sheet for the 2500pf, R85, PE 200, 14kvp Ceramic Disc Capacitor, it looks like it is rated at 60 amps RMS
?
Tracey G5VU
?
toggle quoted message
Show quoted text
----- Original Message -----
From: Tracey Gardner via Groups.Io <tracey.gardner@...>
Sent: 21/03/2020 15:22:49
Subject: [ham-amplifiers] Plate blocking caps YC156
A number of high voltage/current rating ceramic capacitors??have just come up on eBay in the UK.
It looks like they have come out of some kind of RF heating or medical equipment.
I'd be grateful for any thoughts as to their suitability for use as the plate blocking capacitors for a YC156 amp.
The description and eBay item numbers are as follows
Draloric, 2500pf, PE 200, 14kvp Ceramic Disc Capacitor: Item Number 114153436756
Unilator Type 860, 15kv 2000pf, Capacitor: eBay item number:114154806911
Unilator Type 807, 14kv 2000pf Ceramic Disc Capacitor: eBay item number:114154801609
Unilator Type 910, 15kv 1000pf Ceramic Disc Capacitor: eBay item number:114154801080
Many thanks
?
Tracey G5VU
?
----- Original Message ----- From: Jim VE7RF <jim.thom@...> Reply-To: < [email protected]> To: < [email protected]> Sent: 29/12/2019 15:12:42 Subject: Re: [ham-amplifiers] Plate blocking caps YC156 The??problem??with??broadcast?? mica's (or??any??mica)??is??they??won't handle?? any current??on??higher??freqs.??But??they are??NPO.?? Drake used switchable mica's??in their??MN-2000??ant??tuner (along??with??2 x air??variables).?? Drake??used??7 (SEVEN)?? mica's??in??parallel....just??for 10m??band.....just to handle 1200w??pep into??some??swr.?? Drake??used??a single??700 pf??(NPO) mica??to??pad??the 1600??pf??load??cap on??80m band....??on their L4B??80-10??amp. Those CDE and??similar??mica??caps??are??typ rated??at?? 1??mhz??for??max current.??> 6??mhz, they??have??fallen??off really??fast.??>20??mhz,??they??are??down??to??nothing. Mica's??work??superb??on??low??bands (<6 mhz)....??and ceramic??caps work??superb??>2-3 mhz. For??a plate??block??cap, ceramic??is??used,??since??we??require??a cap(s) that??will??handle loads??of??current on??21-29.7??mhz. (+6M).????On lower??bands,??plate??block??cap??current??drops??way??off.....non??issue. HEC??is??still made??in PA...amish??country.?? Download??the??main??catalog for??CERAMIC???? Draloric is??still??made in??germany. Centralab??was??bought??out??by??ITT-Jennings.??Centralab??(ITT-Jennings)????857 /??859??is??the??same??as a HEC?? HT-57??/??HT-59 Everything??else??is??a chinese copy.?? Also??factor??in??the??heat??from??the??anode??will??travel??down??the strap..to??one??side??of??plate block??caps. Jim?? VE7RF
|
Re: Plate blocking caps YC156
I think one of those should do the trick, Tracey.?? They're a bit physically big, so I'm not sure what they'd do to stray capacitances for tuning on 10m but quite a few builders use them.?? Cheers Dave G0OIL
On Saturday, 21 March 2020, 15:23:00 GMT, Tracey Gardner via Groups.Io <tracey.gardner@...> wrote:
A number of high voltage/current rating ceramic capacitors??have just come up on eBay in the UK.
It looks like they have come out of some kind of RF heating or medical equipment.
I'd be grateful for any thoughts as to their suitability for use as the plate blocking capacitors for a YC156 amp.
The description and eBay item numbers are as follows
Draloric, 2500pf, PE 200, 14kvp Ceramic Disc Capacitor: Item Number 114153436756
Unilator Type 860, 15kv 2000pf, Capacitor: eBay item number:114154806911
Unilator Type 807, 14kv 2000pf Ceramic Disc Capacitor: eBay item number:114154801609
Unilator Type 910, 15kv 1000pf Ceramic Disc Capacitor: eBay item number:114154801080
Many thanks
?
Tracey G5VU
?
----- Original Message ----- From: Jim VE7RF <jim.thom@...> Reply-To: < [email protected]> To: < [email protected]> Sent: 29/12/2019 15:12:42 Subject: Re: [ham-amplifiers] Plate blocking caps YC156 The??problem??with??broadcast?? mica's (or??any??mica)??is??they??won't handle?? any current??on??higher??freqs.??But??they are??NPO.?? Drake used switchable mica's??in their??MN-2000??ant??tuner (along??with??2 x air??variables).?? Drake??used??7 (SEVEN)?? mica's??in??parallel....just??for 10m??band.....just to handle 1200w??pep into??some??swr.?? Drake??used??a single??700 pf??(NPO) mica??to??pad??the 1600??pf??load??cap on??80m band....??on their L4B??80-10??amp. Those CDE and??similar??mica??caps??are??typ rated??at?? 1??mhz??for??max current.??> 6??mhz, they??have??fallen??off really??fast.??>20??mhz,??they??are??down??to??nothing. Mica's??work??superb??on??low??bands (<6 mhz)....??and ceramic??caps work??superb??>2-3 mhz. For??a plate??block??cap, ceramic??is??used,??since??we??require??a cap(s) that??will??handle loads??of??current on??21-29.7??mhz. (+6M).????On lower??bands,??plate??block??cap??current??drops??way??off.....non??issue. HEC??is??still made??in PA...amish??country.?? Download??the??main??catalog for??CERAMIC???? Draloric is??still??made in??germany. Centralab??was??bought??out??by??ITT-Jennings.??Centralab??(ITT-Jennings)????857 /??859??is??the??same??as a HEC?? HT-57??/??HT-59 Everything??else??is??a chinese copy.?? Also??factor??in??the??heat??from??the??anode??will??travel??down??the strap..to??one??side??of??plate block??caps. Jim?? VE7RF
|
Plate blocking caps YC156
A number of high voltage/current rating ceramic capacitors??have just come up on eBay in the UK.
It looks like they have come out of some kind of RF heating or medical equipment.
I'd be grateful for any thoughts as to their suitability for use as the plate blocking capacitors for a YC156 amp.
The description and eBay item numbers are as follows
Draloric, 2500pf, PE 200, 14kvp Ceramic Disc Capacitor: Item Number 114153436756
Unilator Type 860, 15kv 2000pf, Capacitor: eBay item number:114154806911
Unilator Type 807, 14kv 2000pf Ceramic Disc Capacitor: eBay item number:114154801609
Unilator Type 910, 15kv 1000pf Ceramic Disc Capacitor: eBay item number:114154801080
Many thanks
?
Tracey G5VU
?
toggle quoted message
Show quoted text
----- Original Message ----- From: Jim VE7RF <jim.thom@...> Reply-To: < [email protected]> To: < [email protected]> Sent: 29/12/2019 15:12:42 Subject: Re: [ham-amplifiers] Plate blocking caps YC156 The??problem??with??broadcast?? mica's (or??any??mica)??is??they??won't handle?? any current??on??higher??freqs.??But??they are??NPO.?? Drake used switchable mica's??in their??MN-2000??ant??tuner (along??with??2 x air??variables).?? Drake??used??7 (SEVEN)?? mica's??in??parallel....just??for 10m??band.....just to handle 1200w??pep into??some??swr.?? Drake??used??a single??700 pf??(NPO) mica??to??pad??the 1600??pf??load??cap on??80m band....??on their L4B??80-10??amp. Those CDE and??similar??mica??caps??are??typ rated??at?? 1??mhz??for??max current.??> 6??mhz, they??have??fallen??off really??fast.??>20??mhz,??they??are??down??to??nothing. Mica's??work??superb??on??low??bands (<6 mhz)....??and ceramic??caps work??superb??>2-3 mhz. For??a plate??block??cap, ceramic??is??used,??since??we??require??a cap(s) that??will??handle loads??of??current on??21-29.7??mhz. (+6M).????On lower??bands,??plate??block??cap??current??drops??way??off.....non??issue. HEC??is??still made??in PA...amish??country.?? Download??the??main??catalog for??CERAMIC???? Draloric is??still??made in??germany. Centralab??was??bought??out??by??ITT-Jennings.??Centralab??(ITT-Jennings)????857 /??859??is??the??same??as a HEC?? HT-57??/??HT-59 Everything??else??is??a chinese copy.?? Also??factor??in??the??heat??from??the??anode??will??travel??down??the strap..to??one??side??of??plate block??caps. Jim?? VE7RF
|
I think somewhere in my ¡°paper¡± archives I have either a GE or RCA bulletins. I thought that one of them showed how to make a home-brew test jig that would adequately test emissions of transmitting tubes. Now I am going from memory but it had all the common tubes of the era and they even showed an 813 as part of the test. The bulletins are available on line to read. I suggest you try there. ? Mod-U-Lator, Mike(y)/W3SLK ? ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Carl
Sent: Sunday, March 15, 2020 8:03 PM
To: [email protected]
Subject: Re: [ham-amplifiers] AL-811Question? A tube tester uses low voltage?to "test" emission which is far from what the tube does at HV and with RF. Even my fairly high end Hickok 752A is only good to give a quick and basic answer ....if a 811/572B is dead or not, has a short or is gassy. Many of the low end testers do not even have the ability to handle a 4A 6.3V filament. ----- Original Message ----- Sent: Tuesday, March 10, 2020 12:37 PM Subject: Re: [ham-amplifiers] AL-811Question You can if they are good.? Have you checked them on a good tester.? My preference is to buy all three with matching attributes.? But, that is not necessary.? You ca replace the one that is bad.? But, be absolutely sure the other two are good. ? On Tue, Mar 10, 2020 at 11:25 AM BJ-K7BRR via Groups.Io <wcbilljohnson=[email protected]> wrote: I am repairing an AL-811 that was blowing fuses.
I found one of the 811 tubes had a short between the filament and plate.
My question is can I buy an 811A tube and run it with the two existing 811 tubes?
Bill J K7BRR
--
|
?
A tube tester uses low voltage?to "test"
emission which is far from what the tube does at HV and with RF.
?
Even my fairly high end Hickok 752A is only good to
give a quick and basic answer ....if a 811/572B is dead or not, has a short or
is gassy.
?
Many of the low end testers do not even have the
ability to handle a 4A 6.3V filament.
?
Carl
----- Original Message -----
Sent: Tuesday, March 10, 2020 12:37
PM
Subject: Re: [ham-amplifiers]
AL-811Question
You can if they are good.? Have you checked them on a good
tester.? My preference is to buy all three with matching
attributes.? But, that is not necessary.? You ca replace the one
that is bad.? But, be absolutely sure the other two are good.
Lou WA5LOU
On Tue, Mar 10, 2020 at 11:25 AM BJ-K7BRR via
Groups.Io <wcbilljohnson= [email protected]>
wrote: I am repairing an AL-811 that was blowing fuses.
I
found one of the 811 tubes had a short between the filament and
plate.
My question is can I buy an 811A tube and run it with the two
existing 811 tubes?
Bill J K7BRR
--
|
Yes you can.but dont mix brands. Stick to Chinese, USA, Russia, etc
Also do not run at more than 450W out for longevity on the 3 tube amp (600W with the 811H) with import tubes as they are not true 811A's as built by RCA, etc.
Carl
toggle quoted message
Show quoted text
----- Original Message ----- From: BJ-K7BRR via Groups.Io To: [email protected]Sent: Monday, March 09, 2020 5:49 PM Subject: [ham-amplifiers] AL-811Question I am repairing an AL-811 that was blowing fuses. I found one of the 811 tubes had a short between the filament and plate. My question is can I buy an 811A tube and run it with the two existing 811 tubes? Bill J K7BRR --- This email has been checked for viruses by AVG.
|
Smart move Bill!? Let us know how you make out!
Lou WA5LOU
On Thu, Mar 12, 2020 at 5:18 PM BJ-K7BRR via Groups.Io <wcbilljohnson= [email protected]> wrote:
Thanks Lou I went ahead and ordered 3 new 811A's.
Bill J K7BRR
On Thursday, March 12, 2020, 02:32:55 PM MST, Lou Everett, Sr. < loueverettsr@...> wrote:
You can if they are good.? Have you checked them on a good tester.? My preference is to buy all three with matching attributes.? But, that is not necessary.? You ca replace the one that is bad.? But, be absolutely sure the other two are good.
Lou WA5LOU On Tue, Mar 10, 2020 at 11:25 AM BJ-K7BRR via Groups.Io <wcbilljohnson= [email protected]> wrote: I am repairing an AL-811 that was blowing fuses.
I found one of the 811 tubes had a short between the filament and plate.
My question is can I buy an 811A tube and run it with the two existing 811 tubes?
Bill J K7BRR
--
|
Thanks Lou I went ahead and ordered 3 new 811A's.
Bill J K7BRR
On Thursday, March 12, 2020, 02:32:55 PM MST, Lou Everett, Sr. <loueverettsr@...> wrote:
You can if they are good.? Have you checked them on a good tester.? My preference is to buy all three with matching attributes.? But, that is not necessary.? You ca replace the one that is bad.? But, be absolutely sure the other two are good.
Lou WA5LOU
On Tue, Mar 10, 2020 at 11:25 AM BJ-K7BRR via Groups.Io <wcbilljohnson= [email protected]> wrote: I am repairing an AL-811 that was blowing fuses.
I found one of the 811 tubes had a short between the filament and plate.
My question is can I buy an 811A tube and run it with the two existing 811 tubes?
Bill J K7BRR
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You can if they are good.? Have you checked them on a good tester.? My preference is to buy all three with matching attributes.? But, that is not necessary.? You ca replace the one that is bad.? But, be absolutely sure the other two are good.
Lou WA5LOU
On Tue, Mar 10, 2020 at 11:25 AM BJ-K7BRR via Groups.Io <wcbilljohnson= [email protected]> wrote: I am repairing an AL-811 that was blowing fuses.
I found one of the 811 tubes had a short between the filament and plate.
My question is can I buy an 811A tube and run it with the two existing 811 tubes?
Bill J K7BRR
|
Adam Moss