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281. Re: [Amps] sb220...pop. (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 3 Jan 2004 07:11:45 -0800
** There's an article on SB-220 problems at: http://www.somis.org/sb220ci.html _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2004-01/msg00029.html (7,225 bytes)

282. Re: [Amps] Dentron Clipperton L (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 4 Jan 2004 06:51:49 -0800
** Are the filaments open? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2004-01/msg00037.html (7,135 bytes)

283. Re: [Amps] IMD & ALC's (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 4 Jan 2004 10:23:44 -0800
** This is true for those who still use PTT. However, many people (including me) currently use VOX and transceiver-controlled bias switching. Whenever I stop talking, within a fraction of a second,
/archives//html/Amps/2004-01/msg00039.html (9,157 bytes)

284. Re: [Amps] Dentron Clipperton L (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 4 Jan 2004 21:05:10 -0800
Tnx. Are there any grid-fil shorts? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2004-01/msg00041.html (6,783 bytes)

285. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 5 Jan 2004 05:31:52 -0800
** Stabilizing the screen supply with a series pass regulator is not good engineering practice unless a screen supply bleeder is used to protect against reverse screen current. Stabilizing the grid s
/archives//html/Amps/2004-01/msg00045.html (10,013 bytes)

286. Re: [Amps] Step start resistors (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 5 Jan 2004 05:31:52 -0800
** I use a minimum value of R that - when added to the transformer primary R - does not exceed the mains circuit-breaker (or fuse) ampere rating. For example, a Heath SB-220 has 10A breakers and c. 2
/archives//html/Amps/2004-01/msg00046.html (8,594 bytes)

287. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 5 Jan 2004 07:37:24 -0800
** Zeners are plenty good enough at 1/3 of their dissipation rating -- and they are fail-safe. For screen potentials of less than 700v, a zener string is a good choice. ** However, both of the Ugly
/archives//html/Amps/2004-01/msg00049.html (13,536 bytes)

288. Re: [Amps] Step start resistors (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 5 Jan 2004 09:56:21 -0800
** Which is taken care of if relay pull-in is set so that it occurs when the filter caps are at c. 2/3rd of max potential. _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2004-01/msg00054.html (10,813 bytes)

289. Re: [Amps] More Clipperton L (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 6 Jan 2004 06:32:01 -0800
** Tnx, Alek. A high-potential breakdown tester might show a problem since the meltballs you see indicate that the grid may have come in contact with something. cheerz ______________________________
/archives//html/Amps/2004-01/msg00067.html (7,807 bytes)

290. Re: [Amps] Re: Step start...another solution (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 6 Jan 2004 06:32:01 -0800
** In the amplifier I am currently gathering parts for, starting on 120v and switching to 240v would exceed the current rating on the mains power contactor. To limit inrush-current at startup, I am u
/archives//html/Amps/2004-01/msg00068.html (7,257 bytes)

291. Re: [Amps] Hi Pot Tester Addendum (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 7 Jan 2004 06:51:30 -0800
** Another source of high-potential tester components is sign-shops that sell and service neon signs. Such shops typically have used/'previously-owned' neon sign transformers that they sell at little
/archives//html/Amps/2004-01/msg00074.html (8,455 bytes)

292. Re: [Amps] Step Start PhaseAngle cotrollers (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 7 Jan 2004 06:51:31 -0800
** Other disadvantages are that 50 or 60 Hz is too fast of a ramp-up for capacitor filter HV supplies and for thoriated-tungaten filament/cathodes. However for heater-type cathodes using a resonant-c
/archives//html/Amps/2004-01/msg00075.html (7,654 bytes)

293. Re: [Amps] Step Start in General (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 7 Jan 2004 07:49:35 -0800
** The down side is that they add ESR to the mains, which increases HV unregulation. ** A cold, thoriated tungsten filament has c. 8.3 x more Siemens of conductivity than a hot one. ** I still like
/archives//html/Amps/2004-01/msg00077.html (7,817 bytes)

294. Re: [Amps] Step start resistors (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 7 Jan 2004 14:40:19 -0800
** Starting with a resistance that will limit current to the circuit-breaker rating will get one in the ballpark. ** You are correct, Barry _______________________________________________ Amps maili
/archives//html/Amps/2004-01/msg00084.html (11,645 bytes)

295. Re: [Amps] ALPHA 77 RF POWER CAPACITORS (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 8 Jan 2004 04:33:14 -0800
** How much C is: 5&yuml;&yuml;pF? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2004-01/msg00089.html (8,928 bytes)

296. Re: [Amps] ALPHA 77 RF POWER CAPACITORS (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 8 Jan 2004 08:31:44 -0800
** Tnx, Frank. What OS are you using? -- According to ITT-Jennings, their small 500pF and 1000pF doorknob capacitors are for bypassing and coupling applications only because they use a temp-unstable
/archives//html/Amps/2004-01/msg00091.html (10,917 bytes)

297. Re: [Amps] soft start circuits (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 9 Jan 2004 07:05:09 -0800
** Good point, Ian. Sometimes mo' high-tech is not mo' bettah. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2004-01/msg00105.html (7,786 bytes)

298. Re: [Amps] M.O.V.'s (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 9 Jan 2004 09:55:29 -0800
** The filter-C in a typical HV-PS is an excellent spike suppressor since it looks like a virtual dead-short for transients. _______________________________________________ Amps mailing list Amps@co
/archives//html/Amps/2004-01/msg00111.html (7,077 bytes)

299. Re: [Amps] M.O.V.'s (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 9 Jan 2004 09:55:28 -0800
** For the grounded-screen AB1 Ugly amplifiers I built, MOVs popped like popcorn during a HV to ground arc. The solution was a spark-gap (not shown in diagram below) calibrated to arc at c. 500v mor
/archives//html/Amps/2004-01/msg00112.html (9,923 bytes)

300. Re: [Amps] soft start circuits (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 9 Jan 2004 09:55:29 -0800
** The HV filter capacitor in the anode-supply protects against spikes provided that FWB or FWD rectification is employed. ** Good MOVs have straps for leads instead of wires. ______________________
/archives//html/Amps/2004-01/msg00113.html (9,378 bytes)

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