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1. [Amps] Anyone recognize this amp / circuit? (score: 1): Author: "Mark Beckwith" <r-emails@n5ot.com>; Date: Wed, 20 Mar 2013 11:33:56 -0500; I have acquired a homebrew amp as follows: It has two 4-400s in parallel in grounded grid (with a hole for a third one, FWIW). The bandswitch has positions 80-40-20-15. It has TWO 30A Filament transf; /archives//html/Amps/2013-03/msg00276.html (9,543 bytes)
2. Re: [Amps] Solid state amp comparisons (score: 1): Author: "Mark Beckwith" <r-emails@n5ot.com>; Date: Thu, 25 Apr 2013 05:12:55 -0500; Greg, You left off the big dog. http://www.dishtronix.com/prometheus.html "Attention Contestors" The spelling police are up early today. Mark, N5OT Contestor _________________________________________; /archives//html/Amps/2013-04/msg00208.html (7,404 bytes)
3. Re: [Amps] Large Variac controlling HV power supply (score: 1): Author: "Mark Beckwith" <r-emails@n5ot.com>; Date: Thu, 31 Oct 2013 07:26:34 -0500; I think guys have been doing this since time began. I have two different boat anchors out in the barn built exactly as you describe, both built by other people (one is a bona-fide Henry industrial so; /archives//html/Amps/2013-10/msg00462.html (8,406 bytes)
4. Re: [Amps] QRO operation into a 80 meter vertical (score: 1): Author: "Mark Beckwith" <r-emails@n5ot.com>; Date: Fri, 21 Feb 2014 08:25:37 -0600; Sorry [Amps] but this antenna conversation is here and now, No radials because .... no current could be detected in them Does this mean that electrically the exact setup (tower+SteppIR) essentially l; /archives//html/Amps/2014-02/msg00202.html (8,003 bytes)
5. [Amps] Problem with my Henry 2K-4A (score: 1): Author: "Mark Beckwith" <r-emails@n5ot.com>; Date: Tue, 7 Nov 2017 18:52:46 -0600; Greetings, I'm writing the [Amps] reflector in hopes that someone reading will be able to diagnose my problem with confidence. It seems like the Henry 2K-4A is a pretty well-known amp. I imagine the; /archives//html/Amps/2017-11/msg00059.html (7,985 bytes)
6. [Amps] Plate hardware for Eimac tubes (score: 1): Author: "Mark Beckwith" <r-emails@n5ot.com>; Date: Fri, 2 Mar 2018 19:30:41 -0600; Hi - having some difficulty here swapping tubes around. Is there a standard tool/hardware size for the plate caps and heat sinks on top of the Eimac tubes (I'm working with 3-500s and 4-400s this eve; /archives//html/Amps/2018-03/msg00006.html (7,357 bytes)
7. [Amps] W5LAJ amp (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Tue, 22 Jan 2019 13:18:02 -0600; Could you guys take a look at this amp that I have just acquired? Something tells me someone on this reflector can tell me something about it. I heard a rumor that this is not the only amp that W5LA; /archives//html/Amps/2019-01/msg00105.html (7,349 bytes)
8. Re: [Amps] Different versions of 3-500 tubes in amp (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Wed, 23 Jan 2019 08:26:03 -0600; Hi Warren, I have had the same problem. My Henry had two Eimac-looking type 3-500s in it, but one stopped working (that was spectacular all by itself, actually). So I purchased a new 3-500ZG to get; /archives//html/Amps/2019-01/msg00110.html (9,143 bytes)
9. Re: [Amps] W5LAJ amp (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Wed, 23 Jan 2019 09:26:36 -0600; It's got some miscellaneous Alpha 77 components, but it's homebrew, for sure. Very cool. My first amp that's not GG configuration. I have no idea where to start! I would like to get it on the air; /archives//html/Amps/2019-01/msg00111.html (7,751 bytes)
10. [Amps] How to Bypass TR circuitry in Alpha 86 (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Tue, 11 Feb 2020 12:02:30 -0600; Hello Power People, I have an Alpha 86 where something has failed resulting in a fault. Since this failure mode began very shortly after the amp received the newer and stouter PIN diodes, and the am; /archives//html/Amps/2020-02/msg00092.html (7,111 bytes)
11. Re: [Amps] How to Bypass TR circuitry in Alpha 86 (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Thu, 13 Feb 2020 06:03:59 -0600; An Icom 746 PRO. Conventional transceiver. Same radio, same amp, since 2005. Mark N5OT Thanks 73 Jim W7RY I have an Alpha 86 where something has failed resulting in a fault. Since this failure mod; /archives//html/Amps/2020-02/msg00098.html (8,835 bytes)
12. Re: [Amps] How to Bypass TR circuitry in Alpha 86 (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Thu, 13 Feb 2020 07:32:26 -0600; Hi Paul, nice to hear from you. Yeah, I have followed that design modification philosophy about my amp, and used a lot of Alphas. Interesting that QSK was such an end-all goal back in the days befo; /archives//html/Amps/2020-02/msg00100.html (10,339 bytes)
13. Re: [Amps] How to Bypass TR circuitry in Alpha 86 (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Tue, 18 Feb 2020 10:49:29 -0600; I think you guys are discussing something unrelated to my inquiry. 73 - Mark N5OT On 2/14/2020 8:14 AM, Jim Thomson wrote: <The biggest stations run (at least) two radios on each band, one "running"; /archives//html/Amps/2020-02/msg00104.html (10,066 bytes)
14. [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Wed, 18 Mar 2020 10:33:46 -0500; Hello [Amps] Gurus, I had a failure of my Henry 2K-4. I am betting it is a well-known failure mode, and that multiple people on here, after hearing a description of what happened, will be able to te; /archives//html/Amps/2020-03/msg00072.html (8,560 bytes)
15. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Wed, 18 Mar 2020 15:45:48 -0500; Thanks ALL! I'll swap in a different set of tubes to confirm or rule out that it's one of the tubes. Then if it is a tube, I'll do them one at time to figure out which tube it is. Thanks for all the; /archives//html/Amps/2020-03/msg00075.html (9,961 bytes)
16. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Thu, 19 Mar 2020 07:13:43 -0500; Thanks Gerald Actually easier to simply swap tubes than take amp apart enough to get at the socket pins? Mark Mark, Grid to cathode short & stayed failed means you just need an ohmmeter. No need to s; /archives//html/Amps/2020-03/msg00080.html (7,075 bytes)
17. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Thu, 19 Mar 2020 19:31:09 -0500; This is getting more and more exciting all the time. Stay tuned. So to speak. 73 - Mark N5OT Hey Jim & Mark, Stayed failed to me means that the sucker is welded. How do I know this for certain ,you; /archives//html/Amps/2020-03/msg00083.html (8,204 bytes)
18. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Thu, 19 Mar 2020 20:19:30 -0500; I was not thinking about checking the continuity in the tubes themselves when I balked at opening up the amp deep enough to check the continuity at the sockets! I didn't connect those dots initially; /archives//html/Amps/2020-03/msg00084.html (9,639 bytes)
19. Re: [Amps] Henry 2K-4 Failure (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Fri, 20 Mar 2020 14:45:12 -0500; Indeed, I was pretty sure this was a common set of symptoms. Two 3-500z tubes here are about as common as it gets. I was pleased that I'd recalled the pinout of this tube from 4 or 5 decades of memo; /archives//html/Amps/2020-03/msg00091.html (9,014 bytes)
20. Re: [Amps] UM4001CR pin diode source - or Alpha 86 vac relay mad (score: 1): Author: Mark - N5OT <r-emails@n5ot.com>; Date: Sat, 8 Aug 2020 07:19:36 -0500; Hi Chris, I have an Alpha 86. It's been a fantastic amp, literally loafing at 1500 watts output with headroom to spare. For like 20 years. But now it is soft-FAULTing on transmit. I am pretty sure; /archives//html/Amps/2020-08/msg00030.html (10,458 bytes)

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