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21. [Amps] 8877 Socket (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Sun, 14 Sep 2008 10:27:23 -0700 (PDT); Tom: What you are seeing on Ebay is the Johnson 247 socket which is part of the Eimac SK-2210 air socket system. The 247 base typically sells in the $30 range. However, if you are building an amp u; /archives//html/Amps/2008-09/msg00122.html (7,143 bytes)
22. [Amps] 3CPX1500A7 Fil Voltage (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Fri, 9 Jan 2009 10:52:06 -0800 (PST); This issue has been discussed extensively on this and other reflectors in the past.The filament design and construction is the same as the 8877/3CX1500A7 which runs at 5.0v. For pulse service, the fi; /archives//html/Amps/2009-01/msg00071.html (6,647 bytes)
23. [Amps] 8877 for 3-500s (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 21 Jan 2009 17:20:36 -0800 (PST); Don: I will not be judgemental about the swap. I changed out the 3-1000z for an 8877 in my old BTI. It works superbly but there are some downsides to such a change. First, why do you think you need; /archives//html/Amps/2009-01/msg00223.html (7,749 bytes)
24. [Amps] Zero signal current 3CPX800A7 (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Sat, 4 Apr 2009 15:21:32 -0700 (PDT); Don: The zero signal current should be the same as the 3CX800A7. Here is a data sheet for a Svetlana 3CX800A7. The Penta data sheet gives the same numer for SSB. The stated resting current is 15; /archives//html/Amps/2009-04/msg00047.html (7,090 bytes)
25. Re: [Amps] Amps Digest, Vol 76, Issue 23 (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 16 Apr 2009 14:26:59 -0700 (PDT); Contact KI6SZ and see if he has any. He had some made a few years ago, I beleive. Dennis W0JX/8 Send Amps mailing list submissions to amps@contesting.com To subscribe or unsubscribe via the Wor; /archives//html/Amps/2009-04/msg00160.html (8,137 bytes)
26. [Amps] 813 Amps (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 3 Jun 2009 15:01:10 -0700 (PDT); Steve: First, congratulations on trying to make the 813's go. Great choice of tube for a medium power amp. The fact that your loading cap is higher than expected means that your operating Q of the; /archives//html/Amps/2009-06/msg00009.html (7,680 bytes)
27. [Amps] SB-200 vs SB-220 Conversion for 6 Meters (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Tue, 11 Aug 2009 15:06:32 -0700 (PDT); FWIW: Early this Spring, I started to convert my SB220 to 6 meters. It became more complicated than I wanted (i wanted an easy reversal back to the original) so I abandoned my efforts and turned to m; /archives//html/Amps/2009-08/msg00269.html (8,770 bytes)
28. [Amps] TL-922 on 17 Meters (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 24 Sep 2009 17:57:09 -0700 (PDT); Steve: Your TL-922 will operate fine on 17 meters. However, you MUST use the 15 meter position. The reason for this is that the input network will not pass 18 Mhz RF in the 20 meter position but th; /archives//html/Amps/2009-09/msg00286.html (7,475 bytes)
29. [Amps] AL-1200 3CX1200Z7 Tube (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 2 Sep 2010 18:08:23 -0700 (PDT); The AL-1200 is now supplied with the 3CX1200Z7. The change was made in early May and Ameritron had the amp with new tube on display at Dayton this year. There are several circuit changes, mainly a di; /archives//html/Amps/2010-09/msg00002.html (7,498 bytes)
30. [Amps] Options for the AL-1200 (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 22 Sep 2010 11:41:40 -0700 (PDT); Re tube changes for the AL-1200: 1.) See N9ADG's website. About four years ago, several hams put the GS-35b into their AL-1200's. This seems to work ok except that the cooling is below minimum; /archives//html/Amps/2010-09/msg00263.html (8,024 bytes)
31. Re: [Amps] Old Amps on WARC Bands (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Sun, 30 Jun 2013 10:14:57 -0700 (PDT); I have had good success with my Collins 30S-1 on the WARC bands. The manual does state that it was designed to operate on a wide range of frequencies. You have to use the next higher bandswitch posit; /archives//html/Amps/2013-07/msg00000.html (20,689 bytes)
32. [Amps] SB-200 Plate Choke for 6 meters (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Thu, 6 Feb 2014 15:39:31 -0800 (PST); I converted my SB-200 to six meters and used the stock plate choke. It seems to work just fine. The two critical components are the plate tuning capacitor which needs to be much smaller in minimum ca; /archives//html/Amps/2014-02/msg00049.html (6,645 bytes)

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