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261. 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
** I adjust the grid potential so that there is no grid current under max drive. There can be grid current only if a more powerful driver is used. ** Which is why I adjust the grid potential for zer
/archives//html/Amps/2003-12/msg00460.html (15,375 bytes)

262. RE: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 29 Dec 2003 19:36:28 -0800
** I give up. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2003-12/msg00461.html (8,984 bytes)

263. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 29 Dec 2003 19:36:28 -0800
not is amen, Gary _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2003-12/msg00462.html (9,842 bytes)

264. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 30 Dec 2003 02:40:24 -0800
** Which why it's better to tune up a SSB amplifier with a string of pulses instead of A&Oslash; / N&Oslash;N ** It seems to me that a sag in bias potential would simply increase ZSAC slightly -- wh
/archives//html/Amps/2003-12/msg00466.html (12,258 bytes)

265. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 30 Dec 2003 08:58:06 -0800
** The grid does not and can not draw current when a competent operator sets the grid potential just above the level where it can draw grid-current with the max PEP drive that's available. This is t
/archives//html/Amps/2003-12/msg00469.html (11,006 bytes)

266. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 06:05:05 -0800
** amen. Sophisticated electronic regulation in high RF fields is definitely not a piece of cake. ** The circuit at: http://www.somis.org/D.a.04.GIF can easily handle 10mA of grid current, it switch
/archives//html/Amps/2003-12/msg00481.html (12,591 bytes)

267. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 06:05:06 -0800
** Yes. The easiest way to control power is with the microphone gain control. When the microphone gain is reduced to the point that the amplifier's anode current is constant during modulation, the a
/archives//html/Amps/2003-12/msg00482.html (10,892 bytes)

268. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 06:05:06 -0800
** Good point, Gary. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2003-12/msg00483.html (12,442 bytes)

269. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 06:05:05 -0800
** So you are essentially saying that if the grid terminating resistor is blown away by the exciter, the grid driving potential could rise to a higher level and grid-current could flow? Although thi
/archives//html/Amps/2003-12/msg00484.html (10,705 bytes)

270. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 06:05:07 -0800
** Not quite. I do not use a regulated bias supply because the tube manufacturers specify a maximum bias supply impedance for AB1. Typically, the max Z spec is 100k-ohms. The bias supplies I use hav
/archives//html/Amps/2003-12/msg00485.html (13,679 bytes)

271. Re: [Amps] Re: Amps Digest, Vol 12, Issue 59 (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 06:05:07 -0800
** All transceivers overshoot. A competent operator knows to Not tune up a Class AB1 amplifier for SSB use with A&Oslash;/N&Oslash;N/"hammer-down" because the peak output V will not be developed fro
/archives//html/Amps/2003-12/msg00486.html (9,225 bytes)

272. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 06:31:59 -0800
** This situation is virtually guaranteed to happen if an AB1 amplifier's G1 DC bias is adjusted using A&Oslash;-mode. However, if the DC grid bias is set so that no grid current flows on the first
/archives//html/Amps/2003-12/msg00487.html (10,061 bytes)

273. Re: [Amps] Re: Amps Digest, Vol 12, Issue 33 (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 07:38:26 -0800
... ** A 4cx1500A and larger, similar tetrodes can be rebuilt >20-times by recarburizing the thoriated-tungsten filament/cathode. Each rebuild is good for c. 20k hours of useful emission. ___________
/archives//html/Amps/2003-12/msg00489.html (7,439 bytes)

274. Re: [Amps] AL-811 (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 31 Dec 2003 15:49:23 -0800
** WHAT WAS WRONG WITH THE 3, ORIGINAL TUBES? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2003-12/msg00496.html (6,575 bytes)

275. Re: [Amps] AL-811 (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 1 Jan 2004 03:45:06 -0800
** Do you mean a grid-filament short? Do you see springs floating around in the bottom of the glass envelope? _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2004-01/msg00003.html (7,407 bytes)

276. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 1 Jan 2004 05:25:37 -0800
** A grid-terminator R either soaks up the power or it don't. If it doesn't soak, it's croaked. - If the grid-terminator is present and intact it presents the design impedance at the grid over the f
/archives//html/Amps/2004-01/msg00005.html (9,044 bytes)

277. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 1 Jan 2004 05:25:37 -0800
** Eimac's data sheet for the 4cx3000A/8169, page 4: "The circuit resistance of the grid circuit should not exceed 100,000-ohms". ** RE: Svetlana data sheets for the 4cx800A, "Control Grid Operation
/archives//html/Amps/2004-01/msg00006.html (15,837 bytes)

278. Re: [Amps] IMD & ALC's (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 2 Jan 2004 07:45:44 -0800
** Good one, Craig. One problem is trying to convince the ignorant that mo' ALC is not mo' betta. Another problem is manufacturer's owners' manuals which recommend using a certain level of ALC. - suc
/archives//html/Amps/2004-01/msg00020.html (7,312 bytes)

279. Re: [Amps] IMD levels (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 2 Jan 2004 07:45:44 -0800
** The advantage of the ...J over the standard ...D is that the ...J's filament/cathode has c. 7A more peak emission -- if it is ever needed. The result is flatter constant-current curves, especiall
/archives//html/Amps/2004-01/msg00021.html (7,701 bytes)

280. Re: [Amps] IMD & ALC's (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 3 Jan 2004 00:20:14 -0800
** I see c. 20% overshoot on my TS-440S on the first syllable. Running almost no ALC helps. ** Without some form of ALC, excess IMD is a virtual guarantee -- unless the operator religiously rides he
/archives//html/Amps/2004-01/msg00024.html (10,943 bytes)


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