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1. [Amps] Alpha 87A - Gettering NOS 3CX800A7's (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Fri, 29 Mar 2013 11:43:17 -0400; I am sending this on behalf of John who has not been able to get permission to post yet. Please reply either to the List or to him directly at jstarr001@hotmail.com. I have an Alpha 87a and would lik; /archives//html/Amps/2013-03/msg00359.html (6,892 bytes)
2. [Amps] Look at this Custom 10kW Amp (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Tue, 9 Apr 2013 21:38:56 -0400; This 10kW custom amp looks like a work of love. Listed on QTH.com with pictures on http://coolingit.wix.com/md10kw 73 Jerry K1JOS _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2013-04/msg00041.html (6,981 bytes)
3. Re: [Amps] 572's (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Fri, 3 May 2013 10:10:19 -0400; How do you get the proper airflow through the 3CX800A7 bottom up, also with the standard ceramic chimney in a horizontal position? 73 Jerry K1JOS "I have been running a Dentron MLA 2500, modified thi; /archives//html/Amps/2013-05/msg00039.html (8,653 bytes)
4. Re: [Amps] Alpha 87A in Remote Station Service (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Wed, 8 May 2013 22:20:16 -0400; I have an Alpha 87a 'remoted' but in the shack, nevertheless I have not touched any switch on the Alpha in 5 years and do everything by PC software and it works great. Maybe the only thing I would ad; /archives//html/Amps/2013-05/msg00126.html (8,188 bytes)
5. [Amps] FS: Alpha 87A (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Sun, 19 May 2013 23:49:20 -0400; I am selling my mint Alpha 87A with AlphaMax and full output+ The amp was bought from original non-smoker owner in 2007 and though it was in great shape electronically, I had Alpha replace the scuffe; /archives//html/Amps/2013-05/msg00169.html (6,756 bytes)
6. Re: [Amps] Future of RF AMPS (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Tue, 10 Sep 2013 21:37:40 -0400; I am continuing my learning curve to be tech-saavy and would love to build a 50V SS amp instead of playing with HV supplies and ceramic tetrodes. Where does one start? 73 Jerry K1JOS ________________; /archives//html/Amps/2013-09/msg00023.html (7,421 bytes)
7. [Amps] Building an Amp 101 (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Fri, 17 Jan 2014 10:10:02 -0500; I have had a long desire to build my own linear HF or VHF amp. I believe I have the electronic technical skills but after looking at some completed projects like those on WD7S website, I realized I d; /archives//html/Amps/2014-01/msg00090.html (7,596 bytes)
8. Re: [Amps] Building an Amp 101 (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Fri, 17 Jan 2014 11:18:08 -0500; Thanks Paul, I would settle for not pretty, but functional and clearly adequate for RF and electrical safety aspects. Also wanted to use "stuff' I have accumulated over the years . I also don't mind; /archives//html/Amps/2014-01/msg00096.html (10,724 bytes)
9. Re: [Amps] Building an Amp 101 (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Fri, 17 Jan 2014 12:39:12 -0500; Thank you to all who replied and offered advice. It has reinvigorated my quest to build my own amp. No matter how ugly it may appear it will be mine. I retire in mid 2014 and the amp project will be; /archives//html/Amps/2014-01/msg00104.html (9,927 bytes)
10. [Amps] Filament monitoring - LOOKING FOR ELMER (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Tue, 5 Apr 2016 16:34:37 -0400; I am taking every opportunity to learn more and working on my Alpha 87a always provides a good lesson. I have been getting intermittent faults on the filament monitor for the 3CX800A7's showing the f; /archives//html/Amps/2016-04/msg00003.html (8,772 bytes)
11. Re: [Amps] Filament monitoring - LOOKING FOR ELMER (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Thu, 7 Apr 2016 23:31:38 -0400; Hi Chris, Many, many thanks. I have heard that the connectors carrying the sense circuit voltage between LV board and Microcontroller board sometimes get oxidized/dirty so I did remove them and clean; /archives//html/Amps/2016-04/msg00013.html (15,309 bytes)
12. Re: [Amps] Alpha 87a Low receive (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Mon, 13 Jun 2016 12:24:33 -0400; can you clarify what you mean that the receive goes to low? Do you mean you lose sensitivity in receive and need to reset the relay by switching to STBY? 73 Jerry NY2KW I recently acquired a 87A and; /archives//html/Amps/2016-06/msg00039.html (8,620 bytes)
13. Re: [Amps] Alpha 87a Low receive (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Tue, 14 Jun 2016 08:56:33 -0400; Hi Bob, I didn't say the pin diodes were indestructible only that in a well-designed amp like the 87A, the failure rate is low. It isn't the average power that blows them but also the thermal impedan; /archives//html/Amps/2016-06/msg00049.html (9,965 bytes)
14. Re: [Amps] Alpha 87a Low receive (score: 1): Author: "Jerry" <jsternmd@att.net>; Date: Mon, 13 Jun 2016 18:03:59 -0400; The TX and RX pin diodes have been remarkably reliable with infrequent failure. The best explanation for pin diode failure is the system setup - see the following link several years ago by John, W0UN; /archives//html/Amps/2016-06/msg00051.html (10,194 bytes)
15. Re: [Amps] Alpha 87A Alpha Max Upgrade (score: 1): Author: "Jerry O. Stern" <jsternmd@att.net>; Date: Sat, 8 Oct 2016 11:17:16 -0400; I believe the greatest issue with maintaining the 87A further down the road are the hard programmed PALs (16 and 20) that as I understand cannot be read or cloned. Anyone have any success? 73 Jerry N; /archives//html/Amps/2016-10/msg00029.html (9,785 bytes)
16. Re: [Amps] Alpha 87A Alpha Max Upgrade (score: 1): Author: "Jerry O. Stern" <jsternmd@att.net>; Date: Thu, 13 Oct 2016 09:38:45 -0400; Thanks for the thoughtful reply. I was not aware that the 3CX800A7's had any unusual failure rate. Almost all I have seen are still making full output after 20 years though the drive needed may be a; /archives//html/Amps/2016-10/msg00037.html (13,831 bytes)
17. Re: [Amps] Alpha 87A Alpha Max Upgrade (score: 1): Author: "Jerry O. Stern" <jsternmd@att.net>; Date: Thu, 13 Oct 2016 17:42:17 -0400; Hi Brad, I spoke to Glenn or Brad about this around 2 years ago and they said they would not sell the programmed PALS but would replace them in an amp sent to them for service if found bad. It won't; /archives//html/Amps/2016-10/msg00046.html (12,281 bytes)
18. Re: [Amps] Alpha 87A Alpha Max Upgrade (score: 1): Author: "Jerry O. Stern" <jsternmd@att.net>; Date: Fri, 14 Oct 2016 22:03:41 -0400; They have used a few different but equivalent pin diodes. I don't know if this reflector allows attachments but I made one a few years back that compares them attached. Alpha was selling/recommending; /archives//html/Amps/2016-10/msg00059.html (11,268 bytes)
19. Re: [Amps] "Conventional" current flow (score: 1): Author: "Jerry O. Stern" <jsternmd@att.net>; Date: Sat, 19 Nov 2016 15:38:31 -0500; Hi Jim Great explanation as always. So if "flow" is a mathematical construct, in the early days of modern electricity why did the great fathers arbitrarily pick current flow opposite of electron move; /archives//html/Amps/2016-11/msg00064.html (14,878 bytes)
20. Re: [Amps] Conventional" current flow (score: 1): Author: "Jerry O. Stern" <jsternmd@att.net>; Date: Sat, 3 Dec 2016 10:36:39 -0500; I have some pdf of early Army tube manuals explain the theory. They are large files but if interested let me know. Happy Holidays 73 Jerry NY2KW (ex-K1JOS) Dick and others, Go to a hamfest and look f; /archives//html/Amps/2016-12/msg00030.html (9,091 bytes)

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