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261. Re: [Amps] Relay Speed UP Circuit (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 16 Apr 2010 13:05:04 -0400
Jay, See his description in the yellow box on the .PDF version: http://members.cruzio.com/~k6xx/radio/fastrely.pdf You're thinking that components placed in series with the coil would decrease curre
/archives//html/Amps/2010-04/msg00482.html (7,724 bytes)

262. Re: [Amps] [Elecraft] attenuator in amp was Re: K3 and Expert 1K-FA (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 21 Apr 2010 19:17:58 -0400
Yes, that's right, 3 dB per trip to and from the load. Not 3 dB in total as I indicated. Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2010-04/msg00600.html (7,732 bytes)

263. Re: [Amps] K5VT SK (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 29 Apr 2010 08:59:29 -0400
Vince was a definitely a 'real ham' who treasured all aspects of amateur radio history, including literature and telegraph keys. I sold him a Melahan Valiant about twelve years ago. He was especially
/archives//html/Amps/2010-04/msg00690.html (8,255 bytes)

264. Re: [Amps] parasitic suppressor voodoo (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 16 Jul 2010 10:29:26 -0400
Carl, When using a SA to test for the presence of parasitics and spurious resonances, how are you coupling the sample, and where in the PA? Tnx! Paul, W9AC The simplest way to start is with a calibra
/archives//html/Amps/2010-07/msg00166.html (17,643 bytes)

265. Re: [Amps] parasitic suppressor voodoo (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 16 Jul 2010 20:25:54 -0400
Thanks, Carl. Interesting test method. Paul, W9AC -- _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-07/msg00187.html (22,039 bytes)

266. Re: [Amps] New HF amplifier (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 31 Jul 2010 12:26:08 -0400
For USD $3500, that seems a bit risky for me, although I would like to see one in person to more closely inspect component quality, machining, circuit layout, etc. In that price range, there's quite
/archives//html/Amps/2010-07/msg00392.html (9,369 bytes)

267. Re: [Amps] Automotive Relays (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 3 Aug 2010 17:37:03 -0400
Although not strictly an "automotive" relay, W8ZR has conducted extensive tests on the Tyco/Shrack RTB14012, available for USD $1.80 ea. from Mouser Electronics: http://www.mouser.com/Search/Refine.a
/archives//html/Amps/2010-08/msg00027.html (9,839 bytes)

268. Re: [Amps] Do you think he'll get it? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 30 Oct 2010 17:43:23 -0400
Roger, I've long thought that ETO's product evolution was a bit interesting. In the beginning, ETO produced the 70A, 70V, 77, 77D, 77Dx/Sx, all of which have remarkable circuit and cabinet similariti
/archives//html/Amps/2010-10/msg00435.html (9,082 bytes)

269. Re: [Amps] Do you think he'll get it? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 30 Oct 2010 17:57:04 -0400
Some of the amps in that product line have been modified with meter doubler shunts, especially units upgraded to a pair of 3CX800A7s. Paul, W9AC _______________________________________________ Amps m
/archives//html/Amps/2010-10/msg00437.html (8,562 bytes)

270. Re: [Amps] Do you think he'll get it? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 30 Oct 2010 20:56:33 -0400
W9AC's axioms on amplifiers: !) The more I want it, the more expensive it is; and 2) The more I want it, the scarcer it becomes. My best amp finds occur when I'm not even thinking about it. That's w
/archives//html/Amps/2010-10/msg00449.html (8,140 bytes)

271. Re: [Amps] Do you think he'll get it? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 30 Oct 2010 20:58:35 -0400
Carl, That's right and come to think of it...I ever never seen one in person! Judging by the model number was that two (2) 8874s? Paul, W9AC _______________________________________________ Amps maili
/archives//html/Amps/2010-10/msg00451.html (12,087 bytes)

272. Re: [Amps] time to death in the event of a blower failure (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 8 Nov 2010 09:10:38 -0500
That's a concept I used back in the '70s to engage a boxer fan on the back of an HW-101. A precision cylinder thermal switch was used to measure temperature inside the 101's PA compartment. In that
/archives//html/Amps/2010-11/msg00042.html (9,540 bytes)

273. [Amps] Alpha 70/77 Series Replacement Meter Scales (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 10 Nov 2010 18:46:05 -0500
Those of you who own an Alpha 70A, 70V, 77, 77Dx, or 77Sx can now order replacement multimeter scales from Ram Meter (www.rammeter.com ). They have the original negative on file that goes back to the
/archives//html/Amps/2010-11/msg00144.html (7,480 bytes)

274. Re: [Amps] Alpha 70/77 Series Replacement Meter Scales (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 10 Nov 2010 21:32:42 -0500
Carl, That's right. The original Alpha meter movements are still available. I purchased a set a few years ago from Newark. Many of the original OEM parts for Alpha amps are available. Last time I che
/archives//html/Amps/2010-11/msg00151.html (10,685 bytes)

275. Re: [Amps] Replacement of Collins bulbs in the 30S-1 amplifier (and other Collins) (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 14 Nov 2010 19:44:10 -0500
Joel, That's a real concern on filaments as well. My utility line voltage runs about 252 VAC. On my Alpha 77Dx, I ended up installing a bifilar filament choke, even through the cathode and filament a
/archives//html/Amps/2010-11/msg00234.html (9,510 bytes)

276. [Amps] Amp Conversion - 3CX1500D7 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 10 Dec 2010 09:07:02 -0500
I would like to get some feedback about a proposed Alpha 77Dx amp conversion. What I'm considering will be considered sacrilege by many Alpha users -- but I've already added several improvements to m
/archives//html/Amps/2010-12/msg00090.html (8,913 bytes)

277. Re: [Amps] Amp Conversion - 3CX1500D7 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 10 Dec 2010 15:48:41 -0500
To all who responded, both public & private... Many thanks for the feedback. I'll start with Jeff at Harbach Electronics and see where that discussion takes me. Paul, W9AC ___________________________
/archives//html/Amps/2010-12/msg00098.html (7,019 bytes)

278. Re: [Amps] PI-L Thoughts! (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 12 Dec 2010 16:53:23 -0500
Jim, Recycling the basic RF deck from an HF amp carcass seems like a great way to start on a homebrew HF amp project. Your amp looks great. Well done! Paul, W9AC _____________________________________
/archives//html/Amps/2010-12/msg00141.html (15,534 bytes)

279. [Amps] Thermostatic Fan Option for Alpha 87A (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 21 Dec 2010 11:04:22 -0500
I am interested in adding the thermostatic fan option to my Alpha 87A. The fan is in place and is currently active with a rear panel switch. My understanding is that late models employ a temperature
/archives//html/Amps/2010-12/msg00301.html (6,783 bytes)

280. Re: [Amps] 87a Fault 9 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 3 Jan 2011 09:07:46 -0500
I think that's a bit harsh, Chuck. There are many 20 year-old, problem-free 87As performing very well on the bands every day. There's a reason why it's faulting and it's a matter of uncovering the r
/archives//html/Amps/2011-01/msg00023.html (7,924 bytes)

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