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21. Re: [Amps] Alpha 87A owner (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Thu, 6 Sep 2012 15:04:09 -0400
This post is very long, so skip it if you don't want to dive deeply into the issue of 87A repairs. Hopefully, the information will be useful to some of you. The reliability and "repairability" of 87A
/archives//html/Amps/2012-09/msg00090.html (23,146 bytes)

22. Re: [Amps] Alpha 87A Alpha Max Upgrade (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Fri, 14 Oct 2016 19:41:41 -0400
Sounds like they have a very limited supply of the AlphaMax PALS and want to save them for amps sent to them for service, as opposed to making them available to owners of old 87As that want to upgrad
/archives//html/Amps/2016-10/msg00052.html (13,891 bytes)

23. Re: [Amps] Alpha 9500 vs. Acom 2000A questions (score: 1)
Author: Dick Green <wc1m73@gmail.com>
Date: Sun, 4 Dec 2016 15:43:35 -0500
73, Dick WC1M 73, Dick WC1M _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2016-12/msg00069.html (9,166 bytes)

24. Re: [Amps] Alpha 9500 vs. Acom 2000A questions (score: 1)
Author: Dick Green <wc1m73@gmail.com>
Date: Sun, 4 Dec 2016 15:54:15 -0500
I wonder if the 9500's firmware limit is a hangover from the 87A firmware, which has the same limit. My recollection is that it was set low to protect the PIN diodes. Of course the 9500 doesn't have
/archives//html/Amps/2016-12/msg00070.html (8,962 bytes)

25. Re: [Amps] Alpha 9500 vs. Acom 2000A questions (score: 1)
Author: Dick Green <wc1m73@gmail.com>
Date: Sun, 4 Dec 2016 16:08:55 -0500
That's a good strategy if you only have one antenna per band, but not if, like me, you have multiple antennas and antenna combinations per band. That's why I leave AlphaMax on all the time. It's a ne
/archives//html/Amps/2016-12/msg00072.html (11,917 bytes)

26. Re: [Amps] Alpha 9500 vs. Acom 2000A questions (score: 1)
Author: Dick Green <wc1m73@gmail.com>
Date: Sun, 4 Dec 2016 16:42:09 -0500
I think you mean manually select the antenna. The 2000A has that drawback, too -- the user has to manually select the antenna. That's one reason I wrote my own antenna switching software, which passe
/archives//html/Amps/2016-12/msg00076.html (13,276 bytes)

27. Re: [Amps] Alpha fault 17 (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Fri, 9 Dec 2016 12:48:08 -0500
Some additional points: - You may not be able to see evidence of arcing until you remove the choke. - You may need to replace (rewind) the coil. Just count the turns and use the same gauge/type of wi
/archives//html/Amps/2016-12/msg00220.html (9,349 bytes)

28. Re: [Amps] Alpha fault 17 (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Fri, 9 Dec 2016 15:37:36 -0500
I know Don resolved his problem -- a bad wattmeter diode -- but wanted to a couple of comments to Eric's description of the L1 problem. - My L1 was arcing not only to the PCB, but also to the mountin
/archives//html/Amps/2016-12/msg00228.html (12,648 bytes)

29. Re: [Amps] Alpha fault 17 (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Fri, 9 Dec 2016 16:00:56 -0500
I decided not to remove the T/R board. Instead, I cut L1 off the board, leaving about a quarter inch of the wire ends soldered to the PCB. Then I crimped those leads to the ends of the new winding an
/archives//html/Amps/2016-12/msg00231.html (15,965 bytes)

30. Re: [Amps] Alpha 87A Fault 17 (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Sat, 31 Dec 2016 13:51:18 -0500
This one is a long-shot, but are you sure the amp doesn't have bad tuning parameters? It's conceivable that the user tuning parameters for 20m were for a non-resonant antenna or perhaps got corrupted
/archives//html/Amps/2016-12/msg00544.html (18,202 bytes)

31. Re: [Amps] Alpha 87A Fault 17 (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Fri, 6 Jan 2017 13:36:43 -0500
Hi Charlie, I've seen a lot of obscure 87A problems, including with my own amp, but this one takes the cake! damaged the wiring harness when replacing the blower, and that some of the wires were slic
/archives//html/Amps/2017-01/msg00135.html (16,812 bytes)

32. Re: [Amps] Alpha 87A Fault 17 (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Fri, 6 Jan 2017 17:15:05 -0500
Another takeaway from your experience is that a new problem is often a result of the last change that was made! I blush to admit that while repairing one thing I've inadvertently broken something els
/archives//html/Amps/2017-01/msg00138.html (13,975 bytes)

33. Re: [Amps] Alpha Switching Diodes (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Wed, 1 Mar 2017 12:48:41 -0500
One of the known causes of TX pin diode failure is arcing of L1 on the TR board. In older models, the rubber insulating pad under the coil disintegrates over time, allowing exposed parts of the wire
/archives//html/Amps/2017-03/msg00011.html (9,289 bytes)

34. Re: [Amps] Alpha (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Thu, 5 Oct 2017 00:29:25 -0400
At first blush that number looks very low to me. After all, there are quite a few very active contest stations here in New England that do 10,000-20,000 QSOs per year and you don't hear lots of stor
/archives//html/Amps/2017-10/msg00053.html (9,706 bytes)

35. Re: [Amps] Alpha (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Thu, 5 Oct 2017 14:20:24 -0400
I laid in a small supply of PIN diodes from Richardson after Paul posted earlier about the availability. Thanks! The PIN diodes got a bad rap when they failed in early production models, but my origi
/archives//html/Amps/2017-10/msg00059.html (15,801 bytes)

36. Re: [Amps] Alpha (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Thu, 5 Oct 2017 19:57:45 -0400
This makes sense. My recollection is that two ICs had to be changed to do the AlphaMAX upgrade, and those must the U7 PROM and the U9 PAL. Since my amp was working except for RS232, those chips were
/archives//html/Amps/2017-10/msg00066.html (19,841 bytes)

37. Re: [Amps] Thoughts on LK-550 (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Fri, 13 Oct 2017 13:26:58 -0400
I have a 550ZC as well. If it's in good operating order with three good tubes $1,200 is an excellent price -- a bargain I'd say. That said, I'd probably part with mine for that because I haven't used
/archives//html/Amps/2017-10/msg00126.html (9,260 bytes)

38. Re: [Amps] Rick Measures AG6K (SK) (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Sun, 18 Mar 2018 14:46:37 -0400
Very sad. Rick had some controversial ideas, but I enjoyed the debate. He'll be missed. Also, I implemented his SB220 QSK mod and it worked FB! 73, Dick WC1M Sorry to say that Rick, AG6K passed away
/archives//html/Amps/2018-03/msg00058.html (8,017 bytes)

39. [Amps] LK-550ZC fair price, tube testing (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Tue, 27 Mar 2018 16:27:03 -0400
I have an Amp Supply LK-550ZC 1500W QSK amp that worked fine when I last I checked it maybe 10 years ago. I'm planning on offering it to local and regional club members, then to a hamfest if it doesn
/archives//html/Amps/2018-03/msg00068.html (7,736 bytes)

40. Re: [Amps] Alpha 87a No RS-232 (score: 1)
Author: "Dick Green WC1M" <wc1m73@gmail.com>
Date: Wed, 4 Jul 2018 13:42:50 -0400
Hi Gerry, I don't know if this will help, but RS-232 in my 87A stopped working after a lightning surge. The amp was otherwise fully functional. Like you, I operate the amp remotely (though not as far
/archives//html/Amps/2018-07/msg00011.html (12,185 bytes)

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