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21. [AMPS] Alpha/ETO (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Tue, 8 Apr 1997 14:25:50 -0700 (PDT); Shoot -- and my Alpha 87A doesn't even HAVE a bandswitch. I guess I'm screwed. Dave N7UE David B. Ritchie, Esq. D'Alessandro & Ritchie, P.C. -- Intellectual Property Lawyers 3521 E. Yorkshire Road, P; /archives//html/Amps/1997-04/msg00148.html (8,289 bytes)
22. [AMPS] 3cx800 (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Sun, 13 Apr 1997 11:39:26 -0700 (PDT); FYI -- My friends who work for Eimac and design their tubes have repeatedly told me that they are serious about their filament voltage specs and that if you are high or low, it will reduce cathode li; /archives//html/Amps/1997-04/msg00176.html (9,705 bytes)
23. [AMPS] Alpha 374 (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Sun, 13 Apr 1997 11:43:16 -0700 (PDT); Alpha Power should have them -- Try 970-535-4173 Dave N7UE David B. Ritchie, Esq. D'Alessandro & Ritchie, P.C. -- Intellectual Property Lawyers 3521 E. Yorkshire Road, Pasadena, CA 91107-5432 818-683; /archives//html/Amps/1997-04/msg00177.html (7,416 bytes)
24. [AMPS] Alpha 374A (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Sun, 9 Mar 1997 21:47:55 -0800 (PST); I am not familiar with the 374 -- but I am very familiar with the 78 -- so I will assume that they are the same (except for the tube count). I've experienced two problems that could result in this sy; /archives//html/Amps/1997-03/msg00107.html (9,564 bytes)
25. [AMPS] SB220 antenna relay (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Mon, 10 Mar 1997 14:49:07 -0800 (PST); Lots of relays will work -- the one used by Heathkit in the SB220 never quit on me, but I always viewed it as a weak link. Why not just go with a Dow Key, Amphenol or Transco -- these are widely avai; /archives//html/Amps/1997-03/msg00115.html (8,967 bytes)
26. [AMPS] Alpha 91B (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Mon, 10 Mar 1997 14:50:32 -0800 (PST); Give them a call... Alpha Power 14440 Mead Court Longmont, CO 80504 (970) 535-4173 (970) 535-0281 (FAX) Good luck Dave N7UE David B. Ritchie, Esq. D'Alessandro & Ritchie, P.C. -- Intellectual Propert; /archives//html/Amps/1997-03/msg00116.html (7,478 bytes)
27. [AMPS] SB-220 HELP (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Mon, 17 Mar 1997 11:00:56 -0800 (PST); Check the bias circuit Dave N7UE David B. Ritchie, Esq. D'Alessandro & Ritchie, P.C. -- Intellectual Property Lawyers 3521 E. Yorkshire Road, Pasadena, CA 91107-5432 818-683-8800 (TEL) 818-683-8900 (; /archives//html/Amps/1997-03/msg00173.html (8,485 bytes)
28. [AMPS] RE voltage sag (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Mon, 17 Mar 1997 20:23:55 -0800 (PST); For what it is worth -- I built a rather vanilla HV power supply with HUGE variac input to a Peter Dahl 3000 V 1.5A CCS transformer -- some reasonable amount of capacitance, bleeder resistors, etc. f; /archives//html/Amps/1997-03/msg00176.html (10,097 bytes)
29. [AMPS] SB220 (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Wed, 19 Mar 1997 14:52:07 -0800 (PST); I had a similar problem in an Alpha 78 -- it was a popped 1mH RF Choke -- check them -- if they are open, replace -- should be a radio shack part. Dave N7UE David B. Ritchie, Esq. D'Alessandro & Ritc; /archives//html/Amps/1997-03/msg00185.html (7,777 bytes)
30. [AMPS] Icom 756 (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Wed, 19 Mar 1997 14:58:21 -0800 (PST); This is a common problem -- especially with all recent Icom Equipment -- if you want to use such equipment with older amps (Collins, Heathkit, Drake, etc.) be sure to understand the rating of your sw; /archives//html/Amps/1997-03/msg00186.html (9,109 bytes)
31. [AMPS] New ? Alpha 76A (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Thu, 20 Mar 1997 15:14:25 -0800 (PST); Call up Alpha Power 970-535-4173 and get your self a manual. Good luck Dave N7UE David B. Ritchie, Esq. D'Alessandro & Ritchie, P.C. -- Intellectual Property Lawyers 3521 E. Yorkshire Road, Pasadena,; /archives//html/Amps/1997-03/msg00198.html (7,533 bytes)
32. [AMPS] re: Radio Relay (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Thu, 20 Mar 1997 15:17:41 -0800 (PST); Please repost with some sort of diagram -- as I understand it, the 47k goes direct between the Icom RLY OUT and the amp RLY in where exactly is the cap put where exactly is the diode (I assume it is; /archives//html/Amps/1997-03/msg00199.html (8,833 bytes)
33. [AMPS] More on the Amp Relay (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Thu, 20 Mar 1997 15:19:49 -0800 (PST); By "Combo" you mean the cap is connected (1) to ground and (2) to diode anode ? Dave N7UE David B. Ritchie, Esq. D'Alessandro & Ritchie, P.C. -- Intellectual Property Lawyers 3521 E. Yorkshire Road,; /archives//html/Amps/1997-03/msg00200.html (7,785 bytes)
34. [AMPS] General amp questions (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Tue, 25 Mar 1997 08:22:34 -0800 (PST); UNFORTUNATELY, this technique is problematic with amps having a lot of critical control circuits (like modern Alphas 86, 89, 91B, 87A) since it won't turn on until it has most of the voltage it needs; /archives//html/Amps/1997-03/msg00234.html (8,928 bytes)
35. [AMPS] FET Power Amps (score: 1): Author: dbr@alumni.caltech.edu (David B. Ritchie); Date: Fri, 28 Mar 1997 15:45:14 -0800 (PST); Icom makes a very nice amp, albeit incredibly expensive and not quite 1500W Japan Radio makes a nice MOSFET amp at the 1000W level -- also very expensive. The big problem with solid state is that you; /archives//html/Amps/1997-03/msg00292.html (9,855 bytes)

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