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221. Re: [Amps] AM mode (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Fri, 11 Sep 2009 21:48:51 -0700
ORIGINAL MESSAGE: REPLY: The peak power of an AM signal is approximately four times the carrier power. To prevent your amp from flat-topping, you should tune it up at four times the carrier you plan
/archives//html/Amps/2009-09/msg00163.html (7,848 bytes)

222. Re: [Amps] to buy 8 pieces 200uF 500V caps (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 15 Sep 2009 15:27:22 -0700
ORIGINAL MESSAGE: REPLY: Be careful of buying caps from a private seller, especially at a bargain price. They could be decades old even though "brand new". Ask for the date code. Filter cap service i
/archives//html/Amps/2009-09/msg00213.html (8,494 bytes)

223. Re: [Amps] Silver Plating Tank Coil ?? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 19 Sep 2009 16:24:46 -0700
ORIGINAL MESSAGE: REPLY: Agreed. I did a before and after efficiency check on the HF bands and found no measurable difference. I do like the way the coils look though, and if you use the instant plat
/archives//html/Amps/2009-09/msg00248.html (7,225 bytes)

224. Re: [Amps] Silver Plating Tank Coil ?? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sat, 19 Sep 2009 22:00:45 -0700
ORIGINAL MESSAGE: REPLY: I love a good looking homebrew amp, but gold is a poor conductor compared to many other metals and really does not belong on a tank coil. Gold is good for low current applica
/archives//html/Amps/2009-09/msg00252.html (8,575 bytes)

225. Re: [Amps] Dimished Tube Life (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Fri, 25 Sep 2009 14:01:04 -0700
ORIGINAL MESSAGE: REPLY: Do you see any difference between four hours with heater only or four hours running at full output? Are you saying it makes no difference? 73, Bill W6WRT ____________________
/archives//html/Amps/2009-09/msg00318.html (8,734 bytes)

226. [Amps] Alpha sold to RF Concepts (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 29 Sep 2009 21:38:21 -0700
Copied from the ARRL Contest newsletter: "Change is in the wind at Alpha Radio Products <http://www.alpharadioproducts/> as a newly-formed RF Concepts, LLC <http://www.rfconcepts.com/>, has acquired
/archives//html/Amps/2009-09/msg00365.html (7,572 bytes)

227. Re: [Amps] old mags (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Fri, 02 Oct 2009 17:30:05 -0700
ORIGINAL MESSAGE: REPLY: One reason for dong this is so they can connect the cold side of the caps directly back to the common point at the tube socket without having the currents flow through the ch
/archives//html/Amps/2009-10/msg00033.html (7,665 bytes)

228. Re: [Amps] Bird 43 Meter Repair Query (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 04 Oct 2009 19:12:46 -0700
ORIGINAL MESSAGE: REPLY: Anytime I want to stick something to glass, I use aquarium grade silicone RTV, sold in pet shops everywhere. It has no acid outgas like regular RTV so it is safe for delicate
/archives//html/Amps/2009-10/msg00071.html (7,859 bytes)

229. Re: [Amps] Suggestion..... (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 04 Oct 2009 19:21:45 -0700
ORIGINAL MESSAGE: REPLY: I am also the "list owner" of another contesting.com list - RTTY - and I have to politely disagree with George on this. I find it quite annoying to have to edit the "to" fiel
/archives//html/Amps/2009-10/msg00073.html (9,048 bytes)

230. Re: [Amps] LK-500-NTC v. SB-220 v. Clipperrton L (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 05 Oct 2009 02:08:42 -0700
ORIGINAL MESSAGE: REPLY: My recommendation - dead serious - sell them all and get a good used Alpha, any of the 80 or 90 series. 73, Bill W6WRT _______________________________________________ Amps ma
/archives//html/Amps/2009-10/msg00082.html (8,421 bytes)

231. Re: [Amps] SWR meters (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 05 Oct 2009 07:31:35 -0700
ORIGINAL MESSAGE: REPLY: Grumpy and un-cooperative. Autek will not furnish a schematic of their meter, or at least they wouldn't when I had one a few years ago. One problem with the Autek is they mou
/archives//html/Amps/2009-10/msg00087.html (8,235 bytes)

232. Re: [Amps] Watts to DBM?? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 05 Oct 2009 07:41:50 -0700
ORIGINAL MESSAGE: REPLY: Yes, although there is an easier way. The power ratio is the square of the voltage ratio, provided the impedance is the same. Just divide the voltages to get a ratio (3.33333
/archives//html/Amps/2009-10/msg00088.html (7,090 bytes)

233. Re: [Amps] SWR meters (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 05 Oct 2009 17:11:34 -0700
ORIGINAL MESSAGE: REPLY: I don't remember if it had a star washer or not. The real problem is the space is too small to get a wrench in there and tighten it enough. If you could get it really tight I
/archives//html/Amps/2009-10/msg00118.html (8,654 bytes)

234. Re: [Amps] filament choke questions (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Fri, 09 Oct 2009 09:40:22 -0700
ORIGINAL MESSAGE: REPLY: Very little shunting to ground will be taking place. The capacitance merely becomes part of the tuned input circuit. Having said that however, I agree with others that a fila
/archives//html/Amps/2009-10/msg00153.html (8,177 bytes)

235. Re: [Amps] Checking Plate Choke resonance (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 11 Oct 2009 07:34:43 -0700
ORIGINAL MESSAGE: REPLY: Sweep the choke across the planned operating frequencies and watch for any drop or rise in impedance at particular frequencies. As a general rule the impedance of the choke s
/archives//html/Amps/2009-10/msg00171.html (7,507 bytes)

236. Re: [Amps] GU74 and all voltages on the same transformer? (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 12 Oct 2009 16:37:54 -0700
ORIGINAL MESSAGE: REPLY: No. Voltage alone during warm-up will not harm any tube I've ever heard of. However -- do not allow any plate or screen current to be drawn by the tube until warm up is compl
/archives//html/Amps/2009-10/msg00186.html (7,521 bytes)

237. Re: [Amps] Checking Plate Choke resonance (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 12 Oct 2009 16:43:57 -0700
ORIGINAL MESSAGE: REPLY: You are right, I mis-spoke. I should have said ten times the reactance of the plate tune cap, not times the plate load impedance. Sorry. Need more coffee. :-) 73, Bill W6WRT
/archives//html/Amps/2009-10/msg00187.html (8,008 bytes)

238. Re: [Amps] Checking Plate Choke resonance (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 13 Oct 2009 09:03:16 -0700
ORIGINAL MESSAGE: REPLY: Watch for parallel resonances too. Either one will smoke the choke if they are in or near a ham band. 73, Bill W6WRT _______________________________________________ Amps mail
/archives//html/Amps/2009-10/msg00194.html (8,659 bytes)

239. Re: [Amps] Checking Plate Choke resonance (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 13 Oct 2009 16:24:14 -0700
ORIGINAL MESSAGE: REPLY: The parallel resonance is accompanied by very high circulating current in the choke. If you think about it, your pi-network is also a parallel resonant circuit with high circ
/archives//html/Amps/2009-10/msg00202.html (9,103 bytes)

240. Re: [Amps] Checking Plate Choke resonance (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Tue, 13 Oct 2009 19:43:32 -0700
ORIGINAL MESSAGE: REPLY: Parallel resonance is not a problem if the components can handle it. In the filament (input) circuit, the power is much less and the choke wires are much larger (typ 12-14 ga
/archives//html/Amps/2009-10/msg00209.html (9,225 bytes)

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