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Total 32 documents matching your query.

21. [AMPS] Alpha 374a (score: 1): Author: w4th@webtv.net (Tom Hix W4TH); Date: Mon, 20 Sep 1999 21:39:48 -0500 (CDT); I have an old Alpha 374a. I am having some problems with the step start. The meters are supposed to come up in the amber color, and when the warm up is over they are supposed to turn green. Mine come; /archives//html/Amps/1999-09/msg00190.html (7,275 bytes)
22. [AMPS] Alpha 374a (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 21 Sep 1999 09:27:47 -0500; Hi Tom, Check the step start relay...it may be welded shut. GL! Phil, K5PC I have an old Alpha 374a. I am having some problems with the step start. The meters are supposed to come up in the amber col; /archives//html/Amps/1999-09/msg00200.html (7,697 bytes)
23. [AMPS] Alpha 374A (score: 1): Author: ae5b@juno.com (ae5b@juno.com); Date: Tue, 22 Sep 1998 19:39:14 -0500; I have found an Alpha 374A that is for sale locally and I need some information. The 374A added 160, has to be modified for 10, and used a pair of 8874' instead of three. What else changed from the 3; /archives//html/Amps/1998-09/msg00236.html (7,211 bytes)
24. [AMPS] Alpha 374A (score: 1): Author: aa7bg@3rivers.net (K7BG Matt Trott); Date: Sun, 9 Mar 1997 22:33:38 -0700 (MST); The old 374A seems to be acting up a bit. Every time I turn it on it trips off. It did stay on one time long enough for the amber meter lights to turn to green, but something is definitly haywire. Mo; /archives//html/Amps/1997-03/msg00099.html (7,244 bytes)
25. [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)
26. [AMPS] Alpha 374A (score: 1): Author: n4uq@mindspring.com (Richard Byrd); Date: Mon, 10 Mar 1997 14:01:41 -0500; Matt, your 374A likely has a bad tube. Excessive PA current is sensed from a cathode resistor and turns off your rig (hopefully before the fuse blows). Often the tube will exhibit the short after a f; /archives//html/Amps/1997-03/msg00111.html (8,625 bytes)
27. [Amps] Alpha 374A (score: 1): Author: "robert perdue" <kc0hfl@cox.net>; Date: Thu, 12 Apr 2007 19:03:15 -0500; I have a 374A that burns the step start resistors as soon as the power switch is pressed looking for any ideas. I have checked the relays they show no shorts(contacts not burn or welded together) Cou; /archives//html/Amps/2007-04/msg00102.html (6,226 bytes)
28. [Amps] Alpha 374A (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Fri, 8 Aug 2008 13:32:34 -0500; I am gathering info on converting my 374A to 3cx800's does anyone know of anything else being required other than the filament voltage? My original 8874's were shot so this is the cheapest route to b; /archives//html/Amps/2008-08/msg00048.html (6,276 bytes)
29. [Amps] Alpha 374A (score: 1): Author: "Robert Perdue" <kc0hfl@cox.net>; Date: Mon, 11 Aug 2008 13:43:36 -0500; Metal work is all done on the 3cx800 conversion now I am on to the filament voltage and need some thoughts. Not much room for an on board 12v transformer so I was thinking about using a voltage doubl; /archives//html/Amps/2008-08/msg00056.html (6,979 bytes)
30. Re: [Amps] Alpha 374A (score: 1): Author: "Steve Katz" <stevek@jmr.com>; Date: Mon, 11 Aug 2008 11:48:30 -0700; If you're using three tubes, that would require 4.5 Amps at 13.5V for the 3CX800A7s -- an awful lot of current for a voltage doubler. That would require one hell of a doubler (huge capacitors), and i; /archives//html/Amps/2008-08/msg00057.html (7,988 bytes)
31. Re: [Amps] Alpha 374A (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 11 Aug 2008 14:55:33 -0400; How would you fit three 800's in place of a pair of 8874's? Plus the PS isnt rated for even two 800's running anywhere close to at full ratings. The answer to a voltage doubler is yes along with a re; /archives//html/Amps/2008-08/msg00058.html (9,585 bytes)
32. [Amps] Alpha 374A (score: 1): Author: chas <chasm@texas.net>; Date: Sun, 02 Aug 2009 14:51:26 -0500; any owners/users of Alpha 374A amps on the list? I have a couple of questions. thanks chas k5dam _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2009-08/msg00058.html (6,435 bytes)

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