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261. [Amps] homebrew glitch resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 25 Apr 2002 04:36:39 -0700; The 750V rating is max case to chassis V - provided the resistor is touching the chassis. Glitch resistors should not be mounted against the chassis/gnd. Glitch resistors need to be glass-coated/gla; /archives//html/Amps/2002-04/msg00549.html (9,782 bytes)
262. [Amps] winding forms for coils and glitch resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 25 Apr 2002 13:07:25 -0700; ABS and other styrenes have a low dissipation-factor. Delrin has a medium dissipation-factor. When a commercial "3kW" tuner, which used a Delrin roller coil form, was tested in the ARRL lab, the rol; /archives//html/Amps/2002-04/msg00558.html (8,591 bytes)
263. [Amps] GS35B (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Thu, 25 Apr 2002 17:15:01 -0700; Adding a small inductor in series with the grid terminating resistor reduces the input SWR of a grid-driven tetrode at 21 - 28 MHz, however, the tradeoff is increased VHF instability at the anode-re; /archives//html/Amps/2002-04/msg00560.html (6,935 bytes)
264. [Amps] SV572 vs 811A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 26 Apr 2002 09:02:11 -0700; ? As it should, the filament/cathode is the same, and so is the peak emission. ? The 30L-1 is not typical in that it does not use a separate VHF parasitic suppressor for each bottle. With new tubes,; /archives//html/Amps/2002-04/msg00564.html (10,909 bytes)
265. [Amps] Source of 500WV Electrolytics (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 26 Apr 2002 13:12:30 -0700; - Digi-Key currently stocks Panasonic/Matsushita 500WV electrolytics. The p/n for the 390uF/500V unit is P7460. Dimensions are 35mm dia., by 50mm length. Ripple current is rated at 2.22A-rms continuo; /archives//html/Amps/2002-04/msg00567.html (6,728 bytes)
266. [Amps] Transforemr rewinding (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 27 Apr 2002 01:29:14 -0700; The best Cu wire I know of for rewinding transformers and making HV-RF chokes is currently used in electric motor rewinding shops. I think it's called type WL. It is insulated with silicone-varnish,; /archives//html/Amps/2002-04/msg00572.html (6,846 bytes)
267. [Amps] SV572 vs 811A (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 30 Apr 2002 06:14:17 -0700; P. J. O'Rourke said that giving a gov't bureaucrat power is like giving a teenguy car-keys and whisky. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-04/msg00595.html (7,756 bytes)
268. [Amps] SB-220 Manual (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Tue, 30 Apr 2002 15:06:45 -0700; The manual has a useful diagram. The manual's tune-up procedure is not. The diagram is on my Web site. cheers, Mike - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-04/msg00603.html (6,633 bytes)
269. [Amps] IMD vs. Vcc (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 31 Mar 2002 16:20:15 -0800; ? As long as rotten splatter doesn't go outside the band, it is not against the Part 97 rules. ? My 440 has so far operated ok on 16v for a couple of days. Time will tell if it will last. cheers, To; /archives//html/Amps/2002-03/msg00004.html (7,917 bytes)
270. [Amps] equalizing resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 1 Mar 2002 08:18:13 -0800; ? I would. It's a reliable way to bleed off the caps, plus it applies equal V to each. ? 10W, 100k? resistors are not ordinarily able to handle even 1000V - even though that's 10w [read the fine pri; /archives//html/Amps/2002-03/msg00010.html (8,023 bytes)
271. [Amps] equalizing resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Fri, 1 Mar 2002 10:18:45 -0800; equalizing ? provided that the mfg rates the 100k? value for >1100v. Always read the small print. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00012.html (8,472 bytes)
272. [Amps] Equalizing Restistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 2 Mar 2002 09:07:27 -0800; ? Switching to C-input and removing the swinging-choke should raise the anode-V to about 3kVDC, which is c. the same as a SB-220 and TL-922. My guess is that the extant tank components will withstan; /archives//html/Amps/2002-03/msg00017.html (8,307 bytes)
273. [Amps] Equalizing Restistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sat, 2 Mar 2002 20:55:36 -0800; Yes. Sort of. The proper screen potential is c.800v for AB1. Grid bias should be adjusted for c.75mA of ZSAC. This will be c. 120vdc. Screen V is can be obtained from a zener-string. Since the; /archives//html/Amps/2002-03/msg00025.html (10,461 bytes)
274. [Amps] Equalizing Restistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 3 Mar 2002 12:41:38 -0800; ? Sounds good. The CT is an ideal, half-V (c. 1700v)source of current for the zener string, 800v shunt screen regulator. A 25k-?, 40w R should drop the needed V. from instead the My a - R. L. Measur; /archives//html/Amps/2002-03/msg00031.html (14,404 bytes)
275. [Amps] FL2100B Amp (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 3 Mar 2002 18:28:40 -0800; ? Digikey said they will be receiving 200, 500v electrolytics from Matsushita/"Panasonic" in mid March. 100uF seems a bit light. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/me; /archives//html/Amps/2002-03/msg00037.html (6,768 bytes)
276. [Amps] Glitch resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 3 Mar 2002 20:28:51 -0800; 1, 10 -15 0hms, 10w. vitreous enamel for up to 3kV. 2 in series for more than 3kV or >30uF. Bypass each screen pin (2 & 4)with two, different value capacitors say c. 500pF and 2500pF. This helps VHF; /archives//html/Amps/2002-03/msg00040.html (8,326 bytes)
277. [Amps] Winding Toroid Help (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 3 Mar 2002 20:46:02 -0800; ? Stranded #12 Teflon® does well if one fastens it with plastic cable ties. cheers, Terry - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-03/msg00041.html (6,823 bytes)
278. [Amps] Glitch resistors (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 4 Mar 2002 09:35:27 -0800; Yes, with nichrome wire, glass-coated.; /archives//html/Amps/2002-03/msg00049.html (8,130 bytes)
279. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 4 Mar 2002 16:07:38 -0800; Ordinary fans do not create enough air pressure to cool external anode tubes. A centrifugal blower makes more pressure. I like to mount the tube/socket in a cardboard box and measure air pressure wi; /archives//html/Amps/2002-03/msg00057.html (8,506 bytes)
280. [Amps] Fans for 4cx1000/1500 question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Mon, 4 Mar 2002 16:20:55 -0800; ? To measure pressure differential with a manometer, connect one hose below the chassis and the other hose into the anode sucker duct/blower inlet. It matters not whether it's a suck or blow cooling; /archives//html/Amps/2002-03/msg00059.html (8,797 bytes)

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