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Total 238 documents matching your query.

221. Re: [Amps] testing the biggest one (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 2 Aug 2013 21:16:14 -0500
I like Johns comments. It would be interesting to work on a huge project like CERN - and doing something like amp work - now that would be really sweet. It's a pleasant distraction from the reality o
/archives//html/Amps/2013-08/msg00012.html (10,664 bytes)

222. Re: [Amps] testing the biggest one (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 2 Aug 2013 21:27:49 -0500
Jim may have one of those on-line now. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie Whatever happened to the X-2159? http://www.cpii.com/docs/datasheets/81/8974.pdf 73 de Mike W9OJ On 8/2/201
/archives//html/Amps/2013-08/msg00014.html (10,867 bytes)

223. Re: [Amps] design approach for QRO solid state (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 12 Sep 2013 21:51:14 -0500
The SS stuff is haunted by the two gremlins same as always. Low impedances (which make cooking up the I/O and combiners hard to do efficiently) and moving the massive heat generated out fast enough.
/archives//html/Amps/2013-09/msg00098.html (8,044 bytes)

224. Re: [Amps] The Sad State of QST (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 19 Sep 2013 19:05:07 -0500
The ARRL struggles to find new sources of material. So if any of you fine gentlemen (or someone you know) would care to send an article to the league for consideration, they would greatly appreciate
/archives//html/Amps/2013-09/msg00255.html (10,222 bytes)

225. Re: [Amps] 160M PI network Toroidal Coil (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Mon, 7 Oct 2013 14:07:59 -0500
It probably does not matter in any event. Either the gentlemen is running CW/SSB - and in that case, whatever coil he uses will work out FB as the duty cycle won't be much of an issue - a few watts l
/archives//html/Amps/2013-10/msg00107.html (10,624 bytes)

226. Re: [Amps] 160M PI network Toroidal Coil (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Mon, 7 Oct 2013 15:21:06 -0500
Wow, terrible mistakes in the 2nd paragraph. Fixed here: "Or he will be running a data mode and without a lot of care and in that case, the transformer will be at the center of a self-correction even
/archives//html/Amps/2013-10/msg00110.html (11,422 bytes)

227. Re: [Amps] 200-ohm tank and "un-un" in HF amp design? (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sun, 20 Oct 2013 09:27:35 -0500
Didnt the QRO 2500 have this format? 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie What kind of power? What plate voltage and current on the tube? 73 Jim W7RY I'm curious because doing so woul
/archives//html/Amps/2013-10/msg00353.html (9,002 bytes)

228. Re: [Amps] GS23B Plate load resistance for HF (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Wed, 30 Oct 2013 22:36:03 -0500
Bill, Thanks for the update. I think the GS35b is a lot like the general soviet style of the time - big and functional, but not very elegant. ha ha. It's not a great tube functionally, but it looks c
/archives//html/Amps/2013-10/msg00456.html (10,985 bytes)

229. Re: [Amps] GS23B Plate load resistance for HF (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 31 Oct 2013 11:07:07 -0500
What BDV does the GS35b typically show on "good" tubes? 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie ORIGINAL MESSAGE: (may be snipped) There is a major difference between the Western high-mu
/archives//html/Amps/2013-10/msg00471.html (11,260 bytes)

230. Re: [Amps] GS23B Plate load resistance for HF (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 31 Oct 2013 11:38:33 -0500
Lot of names. Hi-pot value. Break down voltage. Leakage test threshold. Its the voltage where the tube starts leaking current. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie OK, I bite: what is
/archives//html/Amps/2013-10/msg00473.html (11,006 bytes)

231. Re: [Amps] GS23B Plate load resistance for HF / audio analogy (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 31 Oct 2013 23:00:42 -0500
Bill, I used these VA3YP sockets in the SB200 overhaul for the GI7b. They are real works of machine art. I would really recommend these in the case a guy has a frequent need to pull tubes (as was my
/archives//html/Amps/2013-11/msg00000.html (8,002 bytes)

232. Re: [Amps] TL922 on 12/17 (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Fri, 1 Nov 2013 22:37:47 -0500
Will that amp work safely on 12/17? 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.
/archives//html/Amps/2013-11/msg00012.html (6,258 bytes)

233. Re: [Amps] Measuring IMD (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Sat, 2 Nov 2013 14:43:22 -0500
A softrock and powersdr will do the job nicely for under $20. As long as the sound card is not clipping and you don't have stray RF, the measurements will be very accurate. The bigger challenge is ge
/archives//html/Amps/2013-11/msg00020.html (12,578 bytes)

234. Re: [Amps] TL922 on 12/17 (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Tue, 5 Nov 2013 10:06:53 -0600
Thanks to everyone who replied. The consensus answer was to rock and roll, the amp works fine on those bands. 73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie --Original Message-- From: Vic Rosen
/archives//html/Amps/2013-11/msg00051.html (8,688 bytes)

235. Re: [Amps] Solid State Relays Again (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Mon, 10 Feb 2014 11:55:19 -0600
I know from personal experience as well that you can zap those SSR in a heart beat. Zapped both the primary side and stepstart SSR in my small amp when I had a tube glitch. Those were new (and expens
/archives//html/Amps/2014-02/msg00073.html (9,483 bytes)

236. Re: [Amps] Solid State Relays Again (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Mon, 10 Feb 2014 16:03:56 -0600
The math is a sideshow. These SSR are getting fried and I'm not sure the root cause has been laid bare. Wrong relay for the application? Some sort of TVS or MOV needed? 73/jeff/ac0c www.ac0c.com alph
/archives//html/Amps/2014-02/msg00085.html (9,766 bytes)

237. Re: [Amps] Solid state relays..again (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Thu, 13 Feb 2014 14:14:13 -0600
As an alternative to a resistor based SSR, what about something like the Cyrdom SST240 soft-start module? This gadget sits next to the SSR and ramps up the duty cycle of the SSR over a 3-second perio
/archives//html/Amps/2014-02/msg00112.html (13,709 bytes)

238. Re: [Amps] parts sales? (score: 1)
Author: "Jeff Blaine" <keepwalking188@yahoo.com>
Date: Wed, 26 Mar 2014 12:31:26 -0500
I don't know about the rest of the ham universe, but finding QRO parts at a less than "equal weight in solid gold" price is a big challenge for me. I suppose if a guy has a 30 year old well cultivate
/archives//html/Amps/2014-03/msg00164.html (9,323 bytes)

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