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261. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 08 Nov 2009 08:29:29 -0800
ORIGINAL MESSAGE: REPLY: I have no experience with hot carrier diodes so I can't recommend them. One thing to be sure of before using them - be sure when they fail due to a current surge, they fail s
/archives//html/Amps/2009-11/msg00123.html (8,318 bytes)

262. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 08 Nov 2009 08:37:16 -0800
ORIGINAL MESSAGE: REPLY: The issue is safety for the operator, not safety for the meter. The problem with B+ metering is it puts the entire B+ on the meter, which is normally mounted where someone co
/archives//html/Amps/2009-11/msg00125.html (8,846 bytes)

263. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 08 Nov 2009 14:46:09 -0800
ORIGINAL MESSAGE: REPLY: The purpose of the diode from B- to chassis is to prevent the B- lead from being driven more than about one volt above ground. Nothing "dinky" about it, just common sense des
/archives//html/Amps/2009-11/msg00128.html (8,655 bytes)

264. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 08 Nov 2009 19:01:56 -0800
ORIGINAL MESSAGE: REPLY: You are half right. I agree it won't prevent tube damage, but it will indeed prevent damage caused by the B- line being driven to the full HV negative with respect to ground.
/archives//html/Amps/2009-11/msg00131.html (9,190 bytes)

265. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 09 Nov 2009 00:46:27 -0800
Anti-parallel means the two diodes are connected in parallel but with reversed polarities. The cathode of each is connected to the anode of the other. A simple parallel connection would have them con
/archives//html/Amps/2009-11/msg00134.html (11,470 bytes)

266. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 09 Nov 2009 00:51:59 -0800
ORIGINAL MESSAGE: REPLY: I don't like the term "anti-parallel" either, but it is an ancient term going way back, and it is quite clear once defined. I'm open to suggestions for something better. To m
/archives//html/Amps/2009-11/msg00135.html (8,516 bytes)

267. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 09 Nov 2009 01:08:05 -0800
ORIGINAL MESSAGE: REPLY: Sorry to disagree, but the B- clamping diode does indeed protect some of the amplifier circuitry. In the case where the B+ is shorted to ground, the B- is instantly driven to
/archives//html/Amps/2009-11/msg00136.html (9,263 bytes)

268. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 09 Nov 2009 08:48:36 -0800
ORIGINAL MESSAGE: REPLY: A pulse with a steep rise time will couple right through a capacitor. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2009-11/msg00142.html (9,190 bytes)

269. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 09 Nov 2009 08:57:02 -0800
ORIGINAL MESSAGE: REPLY: In a conventional GG amp, both B+ and B- are floating with respect to ground, except for the connection from B- to ground for the grid current meter. If the B+ arcs to ground
/archives//html/Amps/2009-11/msg00143.html (9,249 bytes)

270. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 09 Nov 2009 09:05:55 -0800
ORIGINAL MESSAGE: REPLY: That's 120 amps through a 1 amp meter for those few milliseconds. Who in his right mind would want to chance it? :-) As pointed out before , the clamping diode will do its jo
/archives//html/Amps/2009-11/msg00144.html (8,417 bytes)

271. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 09 Nov 2009 18:02:08 -0800
Correct. When B- is connected directly to ground there is no need (or place) for the clamping diode under discussion. It is only needed in GG (cathode driven) amps where the B- is floating with respe
/archives//html/Amps/2009-11/msg00154.html (9,378 bytes)

272. Re: [Amps] B- questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Wed, 11 Nov 2009 11:16:36 -0800
ORIGINAL MESSAGE: REPLY: The rule is simple: To avoid having the B- meter read grid current, connect the grid current meter from ground to the side of the B- meter which goes to the cathode. If you c
/archives//html/Amps/2009-11/msg00172.html (8,395 bytes)

273. Re: [Amps] Test Message (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 15 Nov 2009 00:06:01 -0800
ORIGINAL MESSAGE: REPLY: All problems have been solved, nothing further to discuss. :-) 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2009-11/msg00178.html (6,836 bytes)

274. Re: [Amps] Who sells black rope? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 22 Nov 2009 21:51:06 -0800
ORIGINAL MESSAGE: REPLY: http://www.texastowers.com/phillystran_.htm 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m
/archives//html/Amps/2009-11/msg00234.html (7,809 bytes)

275. Re: [Amps] Right Angle UHF Connector (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 22 Nov 2009 21:53:37 -0800
ORIGINAL MESSAGE: REPLY: Amphenol makes them, but whatever you do, don't buy a cheapie from Radio Shack. They won't handle the power. Don't ask how I know. :-). Personally, I would do it with coax. M
/archives//html/Amps/2009-11/msg00235.html (7,651 bytes)

276. Re: [Amps] SB-220: 1,800 Watts Output (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 30 Nov 2009 13:23:44 -0800
ORIGINAL MESSAGE: REPLY: I have an SB-1000 which I ran on HF for several years and then converted to six meters. It will give 1 kW out on CW or SSB but should be limited to about 600 watts on RTTY or
/archives//html/Amps/2009-11/msg00315.html (9,416 bytes)

277. Re: [Amps] 2x 4cx1500b amp (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 30 Nov 2009 18:25:05 -0800
ORIGINAL MESSAGE: REPLY: Just some food for thought on secondary taps: If you shoot for 3 kVDC output under load, you will be able to run nearly all the modern legal-limit American-design tubes. On t
/archives//html/Amps/2009-11/msg00323.html (8,102 bytes)

278. Re: [Amps] SB-220: 1,800 Watts Output ? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 30 Nov 2009 20:37:45 -0800
REPLY: The way to prevent this kind of fraud is always use either PayPal or a credit card. Either one gives you 100% recourse against fraud. Never send a personal check, money order or cahsier's che
/archives//html/Amps/2009-11/msg00324.html (10,148 bytes)

279. Re: [Amps] SB-220: 1,800 Watts Output (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 30 Nov 2009 20:41:42 -0800
ORIGINAL MESSAGE: REPLY: Running AM, you have to set your carrier much less than 1500 watts to stay within FCC rules for PEP output. You can yak as long as you like. :-) 73, Bill W6WRT ______________
/archives//html/Amps/2009-11/msg00325.html (9,206 bytes)

280. Re: [Amps] SB-220: 1,800 Watts Output (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 01 Dec 2009 11:56:41 -0800
ORIGINAL MESSAGE: REPLY: I remember those from when I was a teenager. We've come a long way, haven't we? 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2009-12/msg00002.html (7,725 bytes)

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