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241. Re: [Amps] SB-220 Tune Cap Replacement (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 22 Dec 2003 20:12:57 -0800
See http://www.cardwellcondenser.com/PAGES/jcsp17.html 154-9-1 is 3000v, 251pF, the same value used. cheerz, Jeff _______________________________________________ Amps mailing list Amps@contesting.com
/archives//html/Amps/2003-12/msg00347.html (7,311 bytes)

242. Re: [Amps] max plate voltage for 4cx800a/GU74B (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 23 Dec 2003 13:09:16 -0800
** I would run it at 3100v, but only for SSB and CW. For RTTY, I would run less. . _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/ma
/archives//html/Amps/2003-12/msg00356.html (7,852 bytes)

243. Re: [Amps] Fw: airspaced C's (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 23 Dec 2003 13:09:16 -0800
** Ste4f -- I find out how much with a high-potential breakdown tester. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi
/archives//html/Amps/2003-12/msg00357.html (7,740 bytes)

244. Re: [Amps] Fw: airspaced C's (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 23 Dec 2003 13:32:48 -0800
** The main thing is choose a Tune-C with less breakdown-V than the bandswitch - so that during a glitch the Tune-C will breakdown first and protect the more-delicate bandswitch. ____________________
/archives//html/Amps/2003-12/msg00360.html (8,795 bytes)

245. Re: [Amps] Happy Holidays & New Year Plans (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 24 Dec 2003 05:49:06 -0800
** I'm looking forward to an innovation that will exceed the current 90% efficiency of Class E. With s 150% or so efficient amplifier, it should be practical to convert the DC current.that flows Bac
/archives//html/Amps/2003-12/msg00369.html (7,163 bytes)

246. Re: [Amps] Vacuum relays in Dentron MLA-2500 (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 26 Dec 2003 16:50:44 -0800
MLA-2500 ** This job can be performed by a Matsushita "RSD" RF reed relay. Bias T/R switching can be done by an optoisolator and a NPN switch transistor. ____________________________________________
/archives//html/Amps/2003-12/msg00404.html (9,089 bytes)

247. Re: [Amps] Vacuum relays in Dentron MLA-2500 (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 26 Dec 2003 16:50:44 -0800
** Don -- see Figure 7 on my Web site. Two spdt relays are needed for high-speed switching because there is currently no dpdt relay that is quick enough. ____________________________________________
/archives//html/Amps/2003-12/msg00405.html (8,056 bytes)

248. Re: [Amps] Shelf life of 3CPX800A7 tubes (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 27 Dec 2003 02:36:09 -0800
** Spare tubes last indefinitely unless there is a micro-leak in a seal. If my amplifier used a tube that was still in production, I would not keep a spare, and I do not. -- Hazards to the 3cx800A7 a
/archives//html/Amps/2003-12/msg00410.html (7,921 bytes)

249. Re: [Amps] Vacuum Relays for Sale (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 27 Dec 2003 02:47:18 -0800
** Is there a resistor in series with each swamper diode?... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2003-12/msg00411.html (7,129 bytes)

250. Re: [Amps] Vacuum relays in Dentron MLA-2500 (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 27 Dec 2003 02:47:19 -0800
** Plastic-case transistors are pretty close. ** Are the relays screwed/bolted direct to the chassis? _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2003-12/msg00412.html (8,730 bytes)

251. Re: [Amps] DUMMY LOADS (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 28 Dec 2003 09:02:58 -0800
** The most practical way to cool a 50-ohm terminating resistor is with moving water. Bird Co. makes a series of terminations that do this. A sealed 3" ABS tube - with glued-on inlet and outlet gard
/archives//html/Amps/2003-12/msg00424.html (8,474 bytes)

252. Re: [Amps] DUMMY LOADS (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 28 Dec 2003 10:14:02 -0800
** This post contains a typographical blunder -- i.e., Bird's running-water cooled terminations are made from metal, Not plastic. The one I am planning to build is constructed from standard plumbing
/archives//html/Amps/2003-12/msg00427.html (9,432 bytes)

253. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 28 Dec 2003 16:45:06 -0800
** The positive-floating V regulator circuit shown at: http://www.somis.org/D.a.08.GIF regulates to better than +/- 0.1%. I have used this circuit to regulate 6000V.. Since an FET pass element is ut
/archives//html/Amps/2003-12/msg00436.html (9,586 bytes)

254. RE: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 28 Dec 2003 17:33:51 -0800
supplies ** Bias supply regulation is not a factor in Class AB1 since zero current is drawn from the bias supply. _______________________________________________ Amps mailing list Amps@contesting.co
/archives//html/Amps/2003-12/msg00439.html (8,338 bytes)

255. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 29 Dec 2003 00:11:27 -0800
** What is going to charge the capacitor at turn-on when the capacitor is at 0v? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2003-12/msg00444.html (9,229 bytes)

256. RE: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 29 Dec 2003 00:11:27 -0800
** Dr. Schmidt: A Class AB1 bias supply can not be replaced by a capacitor. The bias supply needs to: be transformer-powered from the electric mains be adjustable, and have less than the max Z speci
/archives//html/Amps/2003-12/msg00445.html (11,736 bytes)

257. RE: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 29 Dec 2003 00:11:28 -0800
** Because the tube needs to be biased to cutoff at turn-on or the tube will draw maximal anode current. For example, with 0v on the grid, a 4cx1500A draws c. 3A at 4000V. __________________________
/archives//html/Amps/2003-12/msg00446.html (9,503 bytes)

258. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 29 Dec 2003 01:22:55 -0800
** Steve -- A 4cx1500A needs c. 180v to cut the tube off. A transformer seems to be a bit more practical than a battery. _______________________________________________ Amps mailing list Amps@contes
/archives//html/Amps/2003-12/msg00448.html (9,612 bytes)

259. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 29 Dec 2003 06:41:46 -0800
** Ian -- For AB2, yes, but for AB1, control grid V-stability matters not since there is no grid current. ** Transformer secondary-winding resistance is inherently low with a FWD becaise only half a
/archives//html/Amps/2003-12/msg00450.html (14,364 bytes)

260. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 29 Dec 2003 19:29:26 -0800
Where does one purchase such? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2003-12/msg00459.html (9,931 bytes)


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