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301. Re: [Amps] Homebrew "Hi-Pot" design issues (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 9 Jan 2004 10:35:50 -0800
** 7.5kV-rms produces 21,6k PIV in a halfwave rectifier circuit. I would go with c. a 30k-PIV rectifier. Also, with a halfwave rectifier, a 120v MOV should be connected across the primary winding to
/archives//html/Amps/2004-01/msg00115.html (8,899 bytes)

302. Re: [Amps] Homebrew "Hi-Pot" design issues (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 9 Jan 2004 23:04:33 -0800
** The sticky wicket is making the output V adjustable from 0 to maximum. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis
/archives//html/Amps/2004-01/msg00120.html (7,570 bytes)

303. Re: [Amps] RF Power Capacitors (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 12 Jan 2004 07:23:45 -0800
** Hal -- A source of RF transmitting capacitors is: http://www.highenergycorp.com/ceramic/rftransmit.html However, 2000pF is not needed for a pair of 8877s' DC blocker capacitor unless the anplifier
/archives//html/Amps/2004-01/msg00130.html (8,457 bytes)

304. Re: [Amps] Fan delay turn-off (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 13 Jan 2004 04:38:00 -0800
** Arne -- The only instance where a blower delay would be needed would be where the operator does not realize that 10 (or so) seconds of standby cooldown after transmitting on RTTY is a good idea be
/archives//html/Amps/2004-01/msg00134.html (7,223 bytes)

305. Re: [Amps] MagCap Engineering ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 14 Jan 2004 06:09:05 -0800
Ed- - - What is the primary R of the MagCap? What type of core do they use? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/
/archives//html/Amps/2004-01/msg00144.html (8,023 bytes)

306. Re: [Amps] Transformer varnish removal (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 14 Jan 2004 06:21:27 -0800
** Newer magnet wire has a high-temp silicone-varnish coating. I remove the insulation with a propane torch and steel wool, however, paste-type paint-remover might be worth a try. Also, silicones ar
/archives//html/Amps/2004-01/msg00145.html (8,694 bytes)

307. Re: [Amps] Power-off tube cooling (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 16 Jan 2004 17:37:38 -0800
** It depends on the size of the tube. For example, the 8973 spec sheet recommends that forced air cooling on the base continue for two minutes after the filament power (16.3v @600a) is removed _____
/archives//html/Amps/2004-01/msg00165.html (8,609 bytes)

308. Re: [Amps] transformer secondary winding resistance here we go again (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 16 Jan 2004 17:37:39 -0800
** More R means less V-regulation. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2004-01/msg00166.html (7,706 bytes)

309. Re: [Amps] NCL-2000 (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 16 Jan 2004 17:37:38 -0800
**Pierre -- There are some circuit improvements that will protect the delicate 8122 screens in the event of a problem. Diagram at: http://www.somis.org/ncl2k.JPEG ____________________________________
/archives//html/Amps/2004-01/msg00167.html (7,189 bytes)

310. RE: [Amps] Transformer varnish removal (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 16 Jan 2004 22:53:00 -0800
** MEK vapor is not as dangerous to brain cells as is toluene. Neither should not be used in a closed room. _______________________________________________ Amps mailing list Amps@contesting.com http:
/archives//html/Amps/2004-01/msg00168.html (10,492 bytes)

311. Re: [Amps] TT Titan 425 SAFETY QUESTION (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 18 Jan 2004 22:22:14 -0800
** Todd -- Shorting a charged HV filter-C to chassis-ground can damage an amplifier's metering circuitry. Instead of a shorting-stick, I use a discharge-stick with a 100W, 1000-ohm series resistor to
/archives//html/Amps/2004-01/msg00185.html (8,273 bytes)

312. Re: [Amps] HV SAFETY QUESTION (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 19 Jan 2004 23:38:02 -0800
** However, it seems unlikely that enough Joules are stored to do any serious damage to a human -- even with the typical remaining charge on a 25uF or so filter C. __________________________________
/archives//html/Amps/2004-01/msg00196.html (7,801 bytes)

313. Re: [Amps] Alpha 76AE, help (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 19 Jan 2004 23:38:02 -0800
** The first thing I would try is to replace the blown parts, remove the tubes, and see it it still has a problem. If it stops blowing fuses, there's a chance that the tubes have gold sputtering dam
/archives//html/Amps/2004-01/msg00197.html (7,706 bytes)

314. Re: [Amps] HV SAFETY QUESTION (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 20 Jan 2004 07:13:14 -0800
** Colin = Was the HV on when you were zapped, or were you tossed across the room by the stored charge? _______________________________________________ Amps mailing list Amps@contesting.com http://l
/archives//html/Amps/2004-01/msg00204.html (7,898 bytes)

315. RE: [Amps] Transformer varnish removal (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 20 Jan 2004 10:30:43 -0800
So does toluene, acetone, tomcat spray and brake fluid. Tomcat spray also works well for pre-paint etching of aluminum - however, it's somewhat difficult to get one to cooperate. cheers, Jason _____
/archives//html/Amps/2004-01/msg00205.html (8,251 bytes)

316. Re: [Amps] combine (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 21 Jan 2004 05:25:08 -0800
** Or -- build a tetrode-with-handles 20db amplifier. I see 8171s going for under $300 on eBay. Svetlana makes sockets. two. _______________________________________________ Amps mailing list Amps@co
/archives//html/Amps/2004-01/msg00215.html (8,178 bytes)

317. Re: [Amps] transformer secondary winding resistance here we go again (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 21 Jan 2004 22:41:47 -0800
** Steve - 10x I-dc^2 is more like it with a low ESR and a C-filter. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf
/archives//html/Amps/2004-01/msg00222.html (8,402 bytes)

318. Re: [Amps] SB-1000 - 3-500Z restoration (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 22 Jan 2004 23:17:50 -0800
** How is it known that the tube arcs? ** If the arc makes a loud bang it is not inside the tube, it is in the atmosphere... ** What color is the glow? ** Check tube (filament not lit) with a high-p
/archives//html/Amps/2004-01/msg00244.html (7,905 bytes)

319. Re: [Amps] AL-82 "Glitch" Protection (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 24 Jan 2004 05:18:12 -0800
** The easy solution is to protect the meter movements with back to back 3a diodes across the movements themselves. Protecting the shunts requires some knowledge of polarity at the shunt, understandi
/archives//html/Amps/2004-01/msg00253.html (8,245 bytes)

320. Re: [Amps] Alpha 87A troubles with fault 17 (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 24 Jan 2004 05:37:11 -0800
** In transceivers with an overshoot problem, using a microphone setting that results in minimum ALC indication is good operating practice -- except on Channel 6 , of course. _______________________
/archives//html/Amps/2004-01/msg00254.html (8,699 bytes)

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