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201. Re: [Amps] SB-220 bias question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 30 Aug 2009 21:28:53 -0700
ORIGINAL MESSAGE: REPLY: Gary, your analysis of tank circuits in the rest of your post is very well done, but I take issue with the above paragraph. You are confusing gain linearity with efficiency l
/archives//html/Amps/2009-08/msg00651.html (10,972 bytes)

202. Re: [Amps] Loaded output circuits (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 31 Aug 2009 08:49:57 -0700
ORIGINAL MESSAGE: REPLY: Oh please, Joe. It was your answer to the original question that triggered the whole thread: W4TV: "Running an amplifier in a mis-tuned condition (tune for 1500 W Output and
/archives//html/Amps/2009-08/msg00656.html (8,054 bytes)

203. Re: [Amps] Q vs Load vs Tuning: Myths debunked (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 31 Aug 2009 09:09:32 -0700
ORIGINAL MESSAGE: REPLY: Thanks, Bob. You make me feel the effort was worthwhile. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2009-08/msg00657.html (7,657 bytes)

204. Re: [Amps] The 304H (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 01 Sep 2009 10:57:17 -0700
ORIGINAL MESSAGE: REPLY: Excellent advice to all. These old tubes are becoming rarer by the day and should be preserved for posterity, even if theydon't work anymore. Think how awful it would be for
/archives//html/Amps/2009-09/msg00006.html (8,343 bytes)

205. Re: [Amps] SB-220 bias question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 01 Sep 2009 11:29:39 -0700
ORIGINAL MESSAGE: REPLY: Technically you are correct, but it will be mis-tuned in the "good" direction. It is better for that first voice peak to hit the tube when the VDC is a bit high than the othe
/archives//html/Amps/2009-09/msg00010.html (7,729 bytes)

206. Re: [Amps] The 304H (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 01 Sep 2009 11:45:32 -0700
ORIGINAL MESSAGE: REPLY: I've seen a few of those and they are indeed attractive. Hopefully the tube does not get modified in any way. Mounting the tube in a display box and then installing the lamp
/archives//html/Amps/2009-09/msg00012.html (8,107 bytes)

207. Re: [Amps] TL-922A - Blowing fuses ... with tubes removed ... somewhere in the PS I presume ... here's what I've done so far (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 01 Sep 2009 12:47:23 -0700
ORIGINAL MESSAGE: REPLY: An open filter cap would not blow a fuse. Put everything back together and check for shorts to ground in the HV circuit. In a working amp the resistance to ground should be h
/archives//html/Amps/2009-09/msg00014.html (8,771 bytes)

208. Re: [Amps] Carbon Resistor Substitution (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 03 Sep 2009 10:55:34 -0700
ORIGINAL MESSAGE: REPLY: Caddock also makes a line of non-inductive resistors up to 100 watts, but anything above a few watts requires a heatsink. Mouser carries them. I have used them as a passive l
/archives//html/Amps/2009-09/msg00024.html (8,164 bytes)

209. Re: [Amps] LK-500 Metering (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 03 Sep 2009 11:10:27 -0700
ORIGINAL MESSAGE: REPLY: If you do this, be sure to measure the meter's resistance first. Many current meters have a very low resistance which means the current would have to rise to an excessive amo
/archives//html/Amps/2009-09/msg00025.html (8,311 bytes)

210. Re: [Amps] 4-1000A neutralization (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 03 Sep 2009 18:41:09 -0700
ORIGINAL MESSAGE: REPLY: The first question is what is the frequency of the oscillation? Grounded grid tubes rarely oscillate at the operating frequency. Most likely you have a VHF parasitic, in whic
/archives//html/Amps/2009-09/msg00029.html (7,375 bytes)

211. Re: [Amps] 3-500z Silly question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 03 Sep 2009 18:50:10 -0700
ORIGINAL MESSAGE: REPLY: This may be an old wive's tale, but I read years ago that DC should not be used on a filament of a high power tube. The reason was that it creates a bias condition where one
/archives//html/Amps/2009-09/msg00030.html (7,724 bytes)

212. Re: [Amps] 3-500z Silly question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 03 Sep 2009 22:48:08 -0700
ORIGINAL MESSAGE: REPLY: Forced air cooling would not help. The problem is one end of the filament would be doing more emitting of electrons than the other end and would wear out sooner. Presumably,
/archives//html/Amps/2009-09/msg00038.html (7,845 bytes)

213. Re: [Amps] 4-1000A neutralization (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Fri, 04 Sep 2009 09:33:09 -0700
ORIGINAL MESSAGE: REPLY: I would add that now. That will greatly reduce the input impedance at VHF and may be all you need to stop the oscillation. A simple LC parallel resonant tank with a Q of thre
/archives//html/Amps/2009-09/msg00043.html (7,785 bytes)

214. Re: [Amps] 3-500z Silly question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 05 Sep 2009 14:05:20 -0700
ORIGINAL MESSAGE: REPLY: You could use two 2.5 volt DC supplies with the tap in the middle, but that still does not answer the problem of bias voltage being developed across the filament. It's just n
/archives//html/Amps/2009-09/msg00050.html (8,320 bytes)

215. Re: [Amps] FW: 3-500z Silly question (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 05 Sep 2009 19:22:19 -0700
ORIGINAL MESSAGE: REPLY: This is a grounded grid amp, right? The input impedance of a single 3-500Z will be on the order of 115 ohms according to the Eimac data sheet, but this is only when cathode c
/archives//html/Amps/2009-09/msg00051.html (9,546 bytes)

216. Re: [Amps] 3CX800 and blower (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 07 Sep 2009 09:06:37 -0700
ORIGINAL MESSAGE: REPLY: Personally, I would not risk it with such an expensive tube. The answer to your question, and the only way to be sure is to measure the temperature of the metal-to-creamic se
/archives//html/Amps/2009-09/msg00072.html (8,277 bytes)

217. Re: [Amps] 304TH, 304TL, 813 (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 07 Sep 2009 18:30:45 -0700
ORIGINAL MESSAGE: REPLY: Since the highest frequency band you are running it on is 30 meters, it probably does not matter, but if you ever add higher frequencies, it might. Roller inductors always ha
/archives//html/Amps/2009-09/msg00081.html (8,113 bytes)

218. Re: [Amps] 3CX800 and blower (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 07 Sep 2009 18:36:13 -0700
ORIGINAL MESSAGE: REPLY: No doubt there is a ratio, but it depends on how much air contacts the tube seals vs how much contacts the rest of the tube, especially the anode. Every physical layout is go
/archives//html/Amps/2009-09/msg00082.html (8,087 bytes)

219. Re: [Amps] 3CX800 and blower (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 08 Sep 2009 10:54:52 -0700
ORIGINAL MESSAGE: REPLY: That isn't fail safe. It's fail and burn up the tube. Your comment about KISS is right on, but that means no resistor, no switch, full blower all the time. Noise is your frie
/archives//html/Amps/2009-09/msg00102.html (8,885 bytes)

220. Re: [Amps] RF deck plate tests (simulating HV?) (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Thu, 10 Sep 2009 16:01:36 -0700
ORIGINAL MESSAGE: REPLY: Divide the plate voltage (under load) by the plate current in amps, then divide that by a factor of about 1.6. I say "about" because the exact factor depends on how the tube
/archives//html/Amps/2009-09/msg00145.html (8,476 bytes)

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