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1. [AMPS] Alpha 374A (score: 1): Author: jbrown@luminet.net (James E. Brown); Date: Sat, 1 Dec 2001 06:22:26 -0600; I am new to the list and new to QRO. Bought my first amp a few days ago, an Alpha 374A. I will be using this with a Yaesu 1000-MP. QSK operation is not important to me because I don't do much CW. Jus; /archives//html/Amps/2001-12/msg00001.html (6,903 bytes)
2. [AMPS] Alpha 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 07:52:45 -0800; We use that combo among others at my contest station, K2XR (1000MP/374A) and there's nothing to do to set it up except attach the coax from the rig to the amplifier... The 374A has untuned input and; /archives//html/Amps/2001-12/msg00025.html (8,709 bytes)
3. [AMPS] Alpha 374A (score: 1): Author: 2@vc.net (2); Date: Mon, 3 Dec 2001 10:08:16 -0800; Does the 1000MP lack an RF outout control? - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Adminis; /archives//html/Amps/2001-12/msg00030.html (7,390 bytes)
4. [AMPS] Alpha 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 10:09:37 -0800; Hi Rich, What's an "outout" control? The 1000MP has an output level control indeed. But I never trust just turning down the output level to prevent overdrive of 8874's, they pop way too easily...whic; /archives//html/Amps/2001-12/msg00031.html (8,511 bytes)
5. [AMPS] Alpha 374A (score: 1): Author: 2@vc.net (2); Date: Mon, 3 Dec 2001 13:14:11 -0800; Autopsy shows that the 8874 grid is not damaged by overdrive. The damage is to the cathode's emissive coating - which flakes and shorts the grid. /photo of flaked cathode in "Parasitics Revisited",; /archives//html/Amps/2001-12/msg00039.html (9,274 bytes)
6. [AMPS] Alpha 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 13:37:11 -0800; [Steve Katz] Well, whatever! I only know the cost of 8874's currently sucks and it doesn't seem to be decreasing, so short of replacing them with something else (a serious possibility), I try to tak; /archives//html/Amps/2001-12/msg00040.html (9,506 bytes)
7. [AMPS] Alpha 374A (score: 1): Author: 2@vc.net (2); Date: Mon, 3 Dec 2001 15:31:08 -0800; // Taking care means don't exceed 350mA of I-anode per bottle in AØ mode. - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Su; /archives//html/Amps/2001-12/msg00044.html (8,065 bytes)
8. [AMPS] Alpha 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 3 Dec 2001 15:32:48 -0800; [Steve Katz] What about A3j? Peak Ip can seemingly exceed this. Is there a time constant for the kind of damage you describe? We have one old 3-hole 374 which hits >1Apk Ip all the time and has used; /archives//html/Amps/2001-12/msg00045.html (7,852 bytes)
9. [AMPS] Alpha 374A (score: 1): Author: 2@vc.net (2); Date: Mon, 3 Dec 2001 21:43:36 -0800; The A3J rating is 500mA. In other words, tune it up with a pulser or CW keyer. - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Subm; /archives//html/Amps/2001-12/msg00065.html (8,480 bytes)
10. [AMPS] ALPHA 374A (score: 1): Author: ko4nrbs@yahoo.com (Bill Smith); Date: Thu, 4 Oct 2001 19:08:17 -0700 (PDT); I've found a Alpha 374A amplifier that has not been used for several years. The guy says he'll sell it but does not know what it may be worth. It is in very clean condition and when checked out today; /archives//html/Amps/2001-10/msg00072.html (7,669 bytes)
11. [AMPS] ALPHA 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 5 Oct 2001 07:22:18 -0700; I purchased a 374A in "mint" condition a few years ago for $1295, and felt that was a reasonably good deal. Obviously, the cost of three new replacement tubes is about that! For one with very few hou; /archives//html/Amps/2001-10/msg00080.html (9,587 bytes)
12. [AMPS] ALPHA 374A (score: 1): Author: w6ru@bak.rr.com (Terry Gaiser); Date: Fri, 5 Oct 2001 08:35:34 -0700; I think you are mistaken ... the 374A does exhaust out the top ... has 2 tubes ... no bandpass mode on 10 meters. Terry W6RU so, out problem." -- -- FAQ on WWW: http://www.contesting.com/FAQ/amps Sub; /archives//html/Amps/2001-10/msg00082.html (10,760 bytes)
13. [AMPS] ALPHA 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 5 Oct 2001 09:43:30 -0700; Not my 374A! Hmmmm...it's possible they changed something during the multi-year sales cycle of this product, but the "374" meant "3 x 8874" and used 3 tubes -- at least mine does. They also had a "27; /archives//html/Amps/2001-10/msg00085.html (11,951 bytes)
14. [AMPS] ALPHA 374A (score: 1): Author: w6ru@bak.rr.com (Terry Gaiser); Date: Fri, 5 Oct 2001 11:41:53 -0700; What you describe is the "374" not a "374A" ... 2 different amplifiers. Terry W6RU There's problem." -- If where exhaust you've key-down than -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submiss; /archives//html/Amps/2001-10/msg00088.html (12,942 bytes)
15. [AMPS] ALPHA 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 5 Oct 2001 10:40:15 -0700; Hi Terry, You know, you might be right! My manual is for the 374A, but since I'm at the office and not home, I can't look at the front panel... I recall (I think) the original 374 had a natural alumi; /archives//html/Amps/2001-10/msg00089.html (14,370 bytes)
16. [AMPS] ALPHA 374A (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Fri, 5 Oct 2001 13:29:50 -0500; Was there not also a "manual tune" 374? The 76 series also had various numbers of tubes, depending on model #. (((73))) Phil, K5PC -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@; /archives//html/Amps/2001-10/msg00091.html (7,989 bytes)
17. [AMPS] ALPHA 374A (score: 1): Author: tkass@forpsych.org (Tim Kass); Date: Fri, 5 Oct 2001 13:56:28 -0400; The 374 has 2 8874, as does the 274, but added 160 meters on it, where the 274 did not....the 374A came later... 73 Tim Not my 374A! Hmmmm...it's possible they changed something during the multi-year; /archives//html/Amps/2001-10/msg00092.html (12,669 bytes)
18. [AMPS] ALPHA 374A (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Fri, 5 Oct 2001 14:43:21 -0400; Looks like the 374 was produced with three 8874s and two with the 374A. See the following link for a complete listing of legacy Alpha Amplifier specs... http://www.alpha-amps.com/html/legacy.htm For; /archives//html/Amps/2001-10/msg00093.html (14,670 bytes)
19. [AMPS] ALPHA 374A (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Fri, 5 Oct 2001 11:43:59 -0700; Hi Paul, After dismantling and inspecting a 70V many years ago, I built a six meter water-cooled amp using the 3CV1500, a quart of D-I water and a surplus transmission cooler with a muffin fan...seri; /archives//html/Amps/2001-10/msg00095.html (16,431 bytes)
20. [AMPS] Alpha 374A (score: 1): Author: ve3dmj@rac.ca (VE3DMJ); Date: Tue, 11 Jul 2000 13:07:06 -0400; Hi: A local amateur who isn't on the Internet, has just bought a used Alpha 374A, while cosmetically it is in great shape it does have some faults. 1. The Load and Tune controls are way out of whack; /archives//html/Amps/2000-07/msg00061.html (7,797 bytes)

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