- 381. Re: [Amps] Tubes vs. Solid State (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Wed, 02 May 2012 06:44:39 -0400
- Regarding vapor phase cooling, I had to smile when I read Dick's suggestion to evacuate the cooling system to 1 PSIA, lowering the boiling point to 100F. Seems like this would change everything - at
- /archives//html/Amps/2012-05/msg00049.html (8,400 bytes)
- 382. Re: [Amps] Tubes vs. Solid State (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Wed, 02 May 2012 11:09:14 -0400
- I'm kinda glad that "rlm" has moved off this reflector (he still shows up on sb-220@yahoogroups.com), and wish W8JI and the others would come back here now that the dust has settled. 73, Pete N4ZR Th
- /archives//html/Amps/2012-05/msg00056.html (12,701 bytes)
- 383. [Amps] amps with vacuum pumps (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Wed, 02 May 2012 11:12:10 -0400
- Perhaps someone with practical experience can comment on whether it is hard to maintain a 1 PSI vacuum in a vapor system. -- 73, Pete N4ZR The World Contest Station Database, updated daily at www.con
- /archives//html/Amps/2012-05/msg00057.html (7,292 bytes)
- 384. Re: [Amps] Solid state amplifiers - big ones (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Tue, 08 May 2012 15:05:16 -0400
- I doubt that anyone who'd buy one of these for the amateur bands would be worried about a little IMD. 73, Pete N4ZR The World Contest Station Database, updated daily at www.conteststations.com The Re
- /archives//html/Amps/2012-05/msg00242.html (10,112 bytes)
- 385. Re: [Amps] filament instant heating query / simple remedy (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sat, 16 Jun 2012 09:13:00 -0400
- Don't I remember that one of the few things Rich Measures said, that others agreed with was, that the SB-220 filament transformer inherently limits inrush current to a safe level? 73, Pete N4ZR The W
- /archives//html/Amps/2012-06/msg00202.html (10,782 bytes)
- 386. Re: [Amps] SS Amp questions (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sun, 09 Sep 2012 14:39:41 -0400
- Is that a personal attack, Carl? If so, on whom? 73, Pete N4ZR The World Contest Station Database, at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebe
- /archives//html/Amps/2012-09/msg00140.html (8,696 bytes)
- 387. [Amps] SB-220 reliability and tuning (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Tue, 11 Sep 2012 05:59:43 -0400
- This puzzles me. My SB-220 has run for 12 years of CW contesting (in the SSB position), with only minimal problems. 1200 watts out on 80, down to about 1000 on 10. I added the Harbach high-volume fan
- /archives//html/Amps/2012-09/msg00194.html (10,028 bytes)
- 388. Re: [Amps] MFJ products (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Tue, 11 Sep 2012 06:40:44 -0400
- I must be a real outlier. In recent years, I have bought an Ameritron RCS-10, an MFJ-259B, and an MFJ-1025. All worked fine out of the box and continue to do so. The stuff I build myself should work
- /archives//html/Amps/2012-09/msg00195.html (10,405 bytes)
- 389. Re: [Amps] Chinese sockets (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sat, 15 Sep 2012 06:34:53 -0400
- One trick that I have used here on some 35-year-old sockets is to swap two of the springs from the grid pins with the ones for the filaments. I think it was W8JI who first pointed out here that resis
- /archives//html/Amps/2012-09/msg00245.html (7,562 bytes)
- 390. [Amps] LK-500ZB Amp Supply amplifier (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sat, 22 Sep 2012 11:18:52 -0400
- There's one available for sale locally, and I am sorely tempted, in order to have an amplifier on 160. Pretty good reviews on e-ham, but would like some expert opinions. -- 73, Pete N4ZR The World Co
- /archives//html/Amps/2012-09/msg00272.html (6,972 bytes)
- 391. Re: [Amps] conductive grease for roller inductor (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Tue, 27 Nov 2012 10:27:57 -0500
- CAIG Laboratories makes a series of contact cleaning solutions and lubricants that are non-conductive but work quickly to enhance conduction through switch and connector contacts. I see no reason why
- /archives//html/Amps/2012-11/msg00181.html (11,342 bytes)
- 392. Re: [Amps] Vacuum Relay (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sat, 15 Dec 2012 07:03:55 -0500
- I could sure use asimple-minded explanation of how to connect my dual-trace scope in order to get a display of system timing. The description below, while I'm sure it is correct, doesn't get this his
- /archives//html/Amps/2012-12/msg00088.html (10,441 bytes)
- 393. Re: [Amps] Vacuum Relay (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Tue, 18 Dec 2012 05:58:31 -0500
- Thanks, everyone, for the good ideas. I'm going to spend some quality time looking at W2AEW's videos, for sure, and will do the simple setup for a check of timing through my whole keyer-rig-amp chain
- /archives//html/Amps/2012-12/msg00100.html (10,811 bytes)
- 394. Re: [Amps] looking for assistance with MLA-2500 tank circuit rework (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sat, 05 Jan 2013 17:13:57 -0500
- ...or running into a very high SWR. I can show 1800 watts output from my SB-220 if the load is wacky enough. 73, Pete N4ZR Check out the Reverse Beacon Network at http://reversebeacon.net, blog at re
- /archives//html/Amps/2013-01/msg00049.html (9,683 bytes)
- 395. [Amps] What Old Amp to Buy? (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Tue, 12 Mar 2013 07:12:57 -0400
- With Dayton 2 months away, I'm pondering whether to try to buy an amplifier in the flea market, in order to add 160M QRO to my repertoire. If you were looking, what would you be looking for? Don't ha
- /archives//html/Amps/2013-03/msg00177.html (7,315 bytes)
- 396. Re: [Amps] Coupling a blower to an air system socket (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sat, 16 Mar 2013 07:39:09 -0400
- I *think* I have read (here?) that there is a big difference between the physics of pressurized and unpressurized systems in this respect. Is there anyone out there who understands this and can comme
- /archives//html/Amps/2013-03/msg00219.html (10,301 bytes)
- 397. [Amps] SB220 cooling was: Re: Coupling a blower to an air system socket (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Mon, 18 Mar 2013 06:29:25 -0400
- For what it may be worth, I seem to have cured a recurrent problem with overheated filament pins on my SB-220 (which came unsoldered frequently) by putting a muffin fan directly over the tubes, sucki
- /archives//html/Amps/2013-03/msg00241.html (10,670 bytes)
- 398. [Amps] ACOM support (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sun, 12 May 2013 10:29:34 -0400
- Who is actually doing the service for ACOM amps in the US these days? The ACOM USA web site seems to have disappeared, and Array Solutions' discussion of support for ACOM amps is a little fuzzy beyon
- /archives//html/Amps/2013-05/msg00140.html (7,393 bytes)
- 399. Re: [Amps] Using old amps on WARC query (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sun, 30 Jun 2013 10:34:57 -0400
- I know it has been reported on this reflector that some old amps made the mistake (in retrospect) of parking the resonance of the plate RFC at 24 MHz. The Ameritron RFC substitution seems like a good
- /archives//html/Amps/2013-06/msg00276.html (9,842 bytes)
- 400. [Amps] high voltage fuses (score: 1)
- Author: Pete Smith N4ZR <n4zr@contesting.com>
- Date: Sun, 06 Oct 2013 10:30:52 -0400
- For what it's worth, I see that there are a lot of inexpensive 5KV 0.75-1.0 amp glass fuses listed on ebay for microwave oven use. I assume these would also work in a legal ham amp? -- 73, Pete N4ZR
- /archives//html/Amps/2013-10/msg00073.html (7,201 bytes)
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