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Total 1109 documents matching your query.

241. Re: [Amps] SWR & other things... (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Mon, 02 Mar 2009 22:03:28 -0500
That's a definite yes, yes, and yes...but... Many times the tuner is unnecessary with the old tube amps on some bands, maybe most of the bands they can operate on. Some tuners will give you more rang
/archives//html/Amps/2009-03/msg00080.html (10,126 bytes)

242. Re: [Amps] SWR & other things... (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Tue, 03 Mar 2009 02:24:36 -0500
What! They're not? Must be politicians selling them<:-)) Seriously though, I'd love to have autotuners mounted at the feed points, but that's a bit impractical for a bunch of center fed, half wave sl
/archives//html/Amps/2009-03/msg00084.html (13,607 bytes)

243. Re: [Amps] upcoming storage unit clean out sale - some pictures (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 04 Mar 2009 00:33:12 -0500
Wish I was closer. I'm looking for some test equipment and particularly a good, binocular microscope for circuit board work. 73 Roger (K8RI) _______________________________________________ Amps maili
/archives//html/Amps/2009-03/msg00110.html (8,153 bytes)

244. Re: [Amps] caps across rectifier diodes (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 04 Mar 2009 00:43:32 -0500
I had to laugh at this part. In a former life (pre college) I worked in the semiconductor industry and in particular in the labs. I was given boxes of diodes. *Some* were great with high voltage and
/archives//html/Amps/2009-03/msg00111.html (14,701 bytes)

245. Re: [Amps] DEAD Alpha 91B (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 05 Mar 2009 14:43:00 -0500
The jury is still out on that one<:-)) No reason we can't have multiple candidates. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
/archives//html/Amps/2009-03/msg00158.html (12,675 bytes)

246. Re: [Amps] An Extra Thank You! (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 05 Mar 2009 17:06:46 -0500
IIRC For efficiency it's pretty straight forward it's power out divided by power in (not drive) IOW in this case for GG it's Plate current Ip (0.375 * multiplied by plate voltage. I don't remember wh
/archives//html/Amps/2009-03/msg00180.html (11,655 bytes)

247. Re: [Amps] An Extra Thank You! (Oops) (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 05 Mar 2009 17:10:23 -0500
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-03/msg00181.html (12,819 bytes)

248. Re: [Amps] Fans PABST WAS A BEER ???? (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 05 Mar 2009 20:13:59 -0500
You just weren't thirsty enough. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-03/msg00195.html (10,994 bytes)

249. Re: [Amps] Step-start; improved circuit. (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 08 Mar 2009 21:25:52 -0400
It's been my approach that other than a minimum for each tube, the timing is unimportant. IOW if the tube needs 300 ms, anything longer than that within reason such as 3, or 4, or 5 seconds shouldn'
/archives//html/Amps/2009-03/msg00247.html (8,359 bytes)

250. Re: [Amps] plate dissipation and duty factor (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 12 Mar 2009 14:02:35 -0400
This would work IF you were limited only by plate dissipation, but in reality there are other factors such as cathode emission, grid dissipation, and secondary emission. With most tubes you are still
/archives//html/Amps/2009-03/msg00349.html (16,855 bytes)

251. Re: [Amps] plate dissipation and duty factor (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 12 Mar 2009 23:13:04 -0400
For SSB duty factor should vary with voice characteristics. I would guess that there would be at least a 2:1 variance or more at the extremes, maybe more. My voice which is a bit on the coarse side h
/archives//html/Amps/2009-03/msg00369.html (11,517 bytes)

252. Re: [Amps] plate dissipation and duty factor (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 12 Mar 2009 23:17:41 -0400
How about water cooling? That will greatly increase the plate dissipation capability, but how far can you go before cathode emission becomes the limiting factor, or secondary emission? 73 Roger (K8RI
/archives//html/Amps/2009-03/msg00370.html (21,674 bytes)

253. Re: [Amps] Clips for oil-filled capacitors (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 19 Mar 2009 21:41:45 -0400
No, they are a flat strap from a half to one inch wide with a fairly tight bend on the one end (Like a flat J-bolt that's been squashed) with a threaded rod or bolt silver soldered, brazed, or welded
/archives//html/Amps/2009-03/msg00496.html (10,182 bytes)

254. Re: [Amps] HV smps (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 25 Mar 2009 20:42:10 -0400
Links with spaces removed "do not match any documents" How many watts will they be dissipating? 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com h
/archives//html/Amps/2009-03/msg00510.html (6,956 bytes)

255. Re: [Amps] Silver plating (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Wed, 08 Apr 2009 23:45:10 -0400
It's been discussed on here before. From a practical approach I think you will find the differences on HF to be slight. Possibly on 10 a bit more, but with the large diameter tube and strap used ...T
/archives//html/Amps/2009-04/msg00092.html (7,430 bytes)

256. Re: [Amps] Silver plating (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 09 Apr 2009 00:43:05 -0400
What I typically see is 1/4 to 3/8" tube or 1/2 to 5/8" wide copper strap maybe 1/16" thick. Take a look at one of the old B&W 850A tank coil units. You should be able to find a photo of one some whe
/archives//html/Amps/2009-04/msg00097.html (9,201 bytes)

257. Re: [Amps] Silver plating (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Thu, 09 Apr 2009 00:56:08 -0400
Having done silver plating back when I worked for a living, I can vouch that the chemicals are nasty. I have forgotten the two specific chemicals, but IIRC they are solution of silver Cyanide and pot
/archives//html/Amps/2009-04/msg00099.html (9,977 bytes)

258. Re: [Amps] Silver plating (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 10 Apr 2009 01:04:00 -0400
Dat's da *Stuff*.<:-)) A little goes a long way with care. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li
/archives//html/Amps/2009-04/msg00114.html (8,432 bytes)

259. Re: [Amps] Silver plating (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 10 Apr 2009 05:43:52 -0400
Actually there's lots of it around, just difficult to get due to the hazardous associated with it. That and there is a "replacement" system where you just place a couple of "bricks" coated with a mat
/archives//html/Amps/2009-04/msg00120.html (10,454 bytes)

260. Re: [Amps] Silver plating (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Fri, 10 Apr 2009 05:57:23 -0400
He makes some good points, but I think the material and references are more than a little outdated. Even when I worked in industry we used pure silver (99.999 pure) plus plating and found no degradat
/archives//html/Amps/2009-04/msg00121.html (9,090 bytes)

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