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References: [ +from:royanjoy@ncn.net: 309 ]

Total 309 documents matching your query.

201. Re: [Amps] testing 572-B tubes (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 4 Mar 2006 10:54:49 -0600
Asked, "... So I am wondering if the TUBES might be a little soft... (etc.)" I've used 572-Bs many years. Other than a few uncommon displays of gassyness (glowing between elements) and gas sometimes
/archives//html/Amps/2006-03/msg00065.html (6,555 bytes)

202. Re: [Amps] Bird accuracy, etc. (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Wed, 8 Mar 2006 09:29:04 -0600
Concering, "Now if instead of an anlogue meter, the Bird 43 had a digital readout to 3 places of decimals, people would believe it implicitly, because it would be digital......and digital read outs h
/archives//html/Amps/2006-03/msg00199.html (7,166 bytes)

203. Re: [Amps] Bird accuracy, etc. (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Wed, 8 Mar 2006 11:32:47 -0600
" Accuracy is essentially that of the voltmeter, typically 3 percent." "Have you calibrated that?" Better VOMs, VTVMs and equivalent I believe are typically quite accurate when reading DC voltages ne
/archives//html/Amps/2006-03/msg00212.html (7,323 bytes)

204. Re: [Amps] Bird...for Mike (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Wed, 8 Mar 2006 15:14:31 -0600
Roy, Do you know which issue that was ? I have HR on CDROM and I'll have to give that article a look. 73 de Mike W9OJ No, Sorry I cut out the chart and lost track of the magazine. Good hunting. Roy K
/archives//html/Amps/2006-03/msg00214.html (6,250 bytes)

205. Re: [Amps] input tuning (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 29 Apr 2006 12:38:25 -0500
Stated: "I'm building an amp using a pair of 4-400's in a grounded grid configuration. I was wondering about the input tuning and what the best way of approaching it. I have heard of using everything
/archives//html/Amps/2006-04/msg00436.html (7,073 bytes)

206. Re: [Amps] tank coil heating (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Tue, 16 May 2006 16:00:35 -0500
About... "Chuck asks: What is the issue(s) with using only toroids for a tank circuit? One problem you can have is being able to get thick enough wire on to the core. At 1500 watts, you can have a lo
/archives//html/Amps/2006-05/msg00139.html (8,344 bytes)

207. Re: [Amps] how intermod... (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Tue, 16 May 2006 16:17:53 -0500
Run CW! Roy K6XK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-05/msg00146.html (6,245 bytes)

208. Re: [Amps] One GS-35B or two? (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Wed, 17 May 2006 11:58:32 -0500
Tony said... "There is no use wasting another tube and increasing the demand for filament current, plate current AND lowering your plate load impedance by using two tubes." Tony, huh?, You would not
/archives//html/Amps/2006-05/msg00195.html (7,413 bytes)

209. Re: [Amps] teeny copper strap (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Fri, 9 Jun 2006 17:16:25 -0500
Concerning, " ...is there any non-radio source of appropriate stuff for grounding my SB-220 grids?...(etc.)" Sorry, but I have to bring this up. It seems to me what's good for the goose is good for t
/archives//html/Amps/2006-06/msg00244.html (8,388 bytes)

210. Re: [Amps] zener question (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 25 Jun 2006 15:34:17 -0500
Ken asked, "Fifteen diodes marked "PTC 2050" I have been unable to find any reference to these. I removed one and tested it like a zener, and never detected a breakdown voltage up to 35v, that's wher
/archives//html/Amps/2006-06/msg00392.html (6,988 bytes)

211. Re: [Amps] dual 4-1000 cooling (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 25 Jun 2006 15:41:37 -0500
Hum, "Off the amp, with no back pressure, temp. is only 145 deg. F...(etc.)" I thought with squirrel cages, the load on the motor increases with no back pressure. (??) 73, Roy K6XK __________________
/archives//html/Amps/2006-06/msg00393.html (6,259 bytes)

212. Re: [Amps] again (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 2 Jul 2006 09:32:01 -0500
This question, "There clearly are individuals on this reflector who are more knowledgeable than me, so I will ask this question again, but in a differently worded form. How does the impedance of the
/archives//html/Amps/2006-07/msg00049.html (7,525 bytes)

213. Re: [Amps] transformers (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 16 Jul 2006 09:04:31 -0500
Just thinking about, "The SB220 transformer was designed for a kilowatt INPUT DC, which was the legal input when it was designed. This was about 450 mA at about 2200 volts. It was...(etc)" If this is
/archives//html/Amps/2006-07/msg00442.html (7,731 bytes)

214. Re: [Amps] transformers (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 16 Jul 2006 14:06:49 -0500
Because the SB200 was not rated at a kilowatt input power, as measured on the meters, on SSB. But this seems wrong. When we tune up for maximum output with resulting readings of 450 mA at 2200 volts
/archives//html/Amps/2006-07/msg00452.html (8,516 bytes)

215. Re: [Amps] RF Chokes (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Mon, 17 Jul 2006 09:05:58 -0500
Concerning, "...It's 145 microhenries, so with something around 2kV rms across it, and its reactance of about 3.2kohm at 3.5MHz, there's 625mA of RF in the choke. Plus the DC, of course. Assume that
/archives//html/Amps/2006-07/msg00513.html (7,802 bytes)

216. Re: [Amps] QRO membership revoked (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Mon, 17 Jul 2006 11:51:21 -0500
Degrading. K6XK "I just spent four days of transmitting with less than 26 watts. This is the longest accumulated time I've spent since 1962 or 63 at such a disgusting power level. I have a hollow gna
/archives//html/Amps/2006-07/msg00524.html (6,636 bytes)

217. Re: [Amps] grid fuses (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Fri, 21 Jul 2006 15:21:48 -0500
"Yes, they are as low inductive as 1cm wide straps can be" How about say, five or six number 24 gauge wires in parallel, forming a skeleton strap? You know, inductors in parallel formula. 73, Roy K6X
/archives//html/Amps/2006-07/msg00798.html (7,809 bytes)

218. Re: [Amps] grid fuses (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 22 Jul 2006 10:50:28 -0500
"...If it's open, the most it might do would be to attract a few electrons being negative like was mentioned...(etc.)" In the old days this was called 'contact bias,' and was the principle incorporat
/archives//html/Amps/2006-07/msg00866.html (7,713 bytes)

219. Re: [Amps] salvaging shorted tubes (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 22 Jul 2006 11:04:55 -0500
"...I would like to hear success rates from the various methods. (etc.)" Yes. I blasted an intermittent grid to filament short in a 3-500Z by connecting it across the car battery, and then rotating w
/archives//html/Amps/2006-07/msg00869.html (7,350 bytes)

220. Re: [Amps] making sinks black (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 22 Jul 2006 11:33:45 -0500
"...what difference does it make what color it has as to the heat it will dissipate?" A big difference, if you don't use forced air flow. Black bodies radiate and absorb heat many times more efficien
/archives//html/Amps/2006-07/msg00873.html (6,907 bytes)

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