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Total 26 documents matching your query.

1. [Amps] Commander HF 2500 (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Tue, 23 Jan 2018 10:05:55 -0500
Hello, My Commander HF2500, new in 1996, is still working up to spec, including plate voltage at 2,850 without a load. Should I consider replacing the filter caps? Thanks for your comments. Jay, K2ZT
/archives//html/Amps/2018-01/msg00131.html (9,103 bytes)

2. [Amps] Commander HF2500 Filter Caps Replacement (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Wed, 31 Jan 2018 18:33:06 -0500
Hello, Thanks for all of the advice and info! After considering all of your comments and suggestions, I've decided to have a pro replace the filter caps. I severely injured my right hand in a 2014 ac
/archives//html/Amps/2018-02/msg00001.html (7,639 bytes)

3. Re: [Amps] Equalising the air flow on Commander 2500 tubes/replacement neoprene chimneys (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Fri, 27 Jul 2018 11:30:04 -0400
Steve, I have a Commander HF 2500, 1996 vintage, however, there are no chimneys on top of the 3cx800s and I do not have a "solid screen". The amplifier you're describing may be a later vintage. I don
/archives//html/Amps/2018-07/msg00079.html (9,514 bytes)

4. Re: [Amps] Commander II Amp Parts (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Sat, 20 Oct 2018 16:08:23 -0400
I purchased a Commander HF 2500 in the 90s and bought new replacements from Pat for the unique components. I unwrapped one of the meters and couldn't find a part number, however, it was marked, "Prim
/archives//html/Amps/2018-10/msg00084.html (9,041 bytes)

5. [Amps] Looking for Two 8874s for Henry Tempo 2002 (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Thu, 1 Aug 2019 17:43:50 -0400
I am looking for two 8874s for a Henry Tempo 2002 Amplifier. Thanks! Jay, K2ZT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2019-08/msg00003.html (6,418 bytes)

6. Re: [Amps] SB-220 HV Transformer Wanted ; thread stolen for bias question (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Fri, 1 Nov 2019 08:12:30 -0400
Gary, Thanks for taking the time to write this! Do you teach EE? Jay, K2ZT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li
/archives//html/Amps/2019-11/msg00003.html (18,897 bytes)

7. Re: [Amps] setting trimmer caps on amp RF in/out (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Fri, 21 Feb 2020 00:40:41 -0500
John, Did you need info for a QRO HF 2000? JAY, K2ZT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2020-02/msg00110.html (7,858 bytes)

8. Re: [Amps] DRAKE L4B (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Wed, 29 Apr 2020 11:42:42 -0400
Robert, Nice work on a classic amp! Could you give us some general history of your L4 B? Where was it had it been kept? The tank coil looks heavily oxidized, even flaking, from what I can tell. Thank
/archives//html/Amps/2020-04/msg00028.html (8,553 bytes)

9. Re: [Amps] DRAKE L4B (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Tue, 5 May 2020 23:42:58 -0400
Robert, Did you replace the filter caps in the power supply? Jay, K2ZT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
/archives//html/Amps/2020-05/msg00003.html (10,091 bytes)

10. [Amps] AL-811H Rocker Switch Replacement (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Fri, 16 Oct 2020 12:00:28 -0400
Hello, The plate current/high voltage (Ip/Hv) rocker switch on my 2008 Ameritron AL-811H is intermittent and needs replacement or cleaning(?). I don't believe I would be able to unsolder the 3 wires
/archives//html/Amps/2020-10/msg00028.html (7,733 bytes)

11. [Amps] Bird 43P Stopped Working (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Sun, 15 Nov 2020 14:02:49 -0500
Hello, My Bird 43P has been in line for about 5 years on a shelf above an amp. I keep a Bird 2500 H slug in the meter and rarely rotate it to look at reflected power. Yesterday the Bird 43P indicated
/archives//html/Amps/2020-11/msg00003.html (7,793 bytes)

12. Re: [Amps] Bird 43P Stopped Working (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Tue, 17 Nov 2020 23:46:45 -0500
Thank you all for your help! I very carefully wiped the finger in the line section with the smallest amount possible of Deoxit, reinserted the 2500H slug and rotated it several times. The meter now w
/archives//html/Amps/2020-11/msg00006.html (8,682 bytes)

13. Re: [Amps] Henry RF generators (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Tue, 15 Dec 2020 19:31:01 -0500
Chris, Your name sounds familiar. Did we go to to school together? What is your call? Jay, K2ZT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont
/archives//html/Amps/2020-12/msg00035.html (8,407 bytes)

14. Re: [Amps] Henry RF generators (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Tue, 15 Dec 2020 23:24:44 -0500
Chris, Sorry, but I had a physics class lab partner many years ago named Chris Wilson. Chris was a genius, I was not! He frequently referred yo my set-up of the experiments as a Heath Robinson! He he
/archives//html/Amps/2020-12/msg00042.html (13,132 bytes)

15. Re: [Amps] Source of 811A or 572B tubes? (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Tue, 29 Dec 2020 13:06:57 -0500
Mike, I bought a set of 811As for my AL811H around October from Ameritron/MFJ. I don't know if those tubes will always be available, so I try to keep a couple of sets on hand. My other amp uses 3cx80
/archives//html/Amps/2020-12/msg00073.html (8,429 bytes)

16. [Amps] AL811H and Chinese 811As (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Thu, 7 Jan 2021 15:22:44 -0500
Hello, I recently purchased a set of finals from Ameritron/MFJ for my AL811H, but have not installed them yet because I have "heard" and read the newer 811A tubes do not have the same specs as the on
/archives//html/Amps/2021-01/msg00004.html (7,183 bytes)

17. Re: [Amps] AL811H and Chinese 811As (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Sun, 10 Jan 2021 12:40:26 -0500
Thanks for your reply and direction! Sorry for late reply! One of our children tested positive for Covid and her family is quarantined. She's developed symptoms... They live in another part of NY Sta
/archives//html/Amps/2021-01/msg00009.html (9,285 bytes)

18. Re: [Amps] AL-811 Tube Swap (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Thu, 29 Apr 2021 11:21:28 -0400
Could the graphite plate of a 572B transform from a solid to a gas by sublimation? I would want to know a rough probability of damaging the finals (gassy) by driving them with an input using audio co
/archives//html/Amps/2021-04/msg00104.html (8,477 bytes)

19. Re: [Amps] MLA-2500 Tube Conversion (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Sun, 10 Oct 2021 12:58:04 -0400
You might want to check with an expert on this forum to make sure your filament supply is correct. I run a pair of 3cx800A7s and the designer/builder stressed correct filament voltage, if I remember
/archives//html/Amps/2021-10/msg00006.html (7,728 bytes)

20. Re: [Amps] Triode Amps (score: 1)
Author: Jay Sturtevant <k2ztdx@gmail.com>
Date: Thu, 2 Dec 2021 11:16:01 -0500
AJ, If I remember correctly, you helped me with a spare filter cap. board for my Commander HF 2500. Thank you! What is your opinion of the Command Amps available on the used market today? Jay, K2ZT _
/archives//html/Amps/2021-12/msg00005.html (10,384 bytes)

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