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241. [Amps] AL-80B questions (score: 127): Author: 2 at vc.net (rlm); Date: Sun Mar 9 10:41:10 2003; 3-500Zs that are capable of oscillating at VHF with the built-in 0.15pF feedback C would seem likely to have above average gain. In amplifiers that use a grid RFC per Bill Orr, blaming the tube for; /archives//html/Amps/2003-03/msg00367.html (12,240 bytes)
242. [Amps] AL-80B questions (score: 127): Author: 2 at vc.net (rlm); Date: Sun Mar 9 10:40:59 2003; Amplifiers that happen to have tubes with lower than average VHF amplification tend to be stable. Few amp designers seem to read the fine print in the mfg-specs for HV multiplier resistors. Only one; /archives//html/Amps/2003-03/msg00366.html (14,652 bytes)
243. [Amps] AL-80B questions (score: 127): Author: 2 at vc.net (rlm); Date: Sun Mar 9 10:40:48 2003; Does it seem possible that two of Measures' low-Q suppressors can dissipate about 100w? - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00365.html (8,998 bytes)
244. [Amps] Ameritron AL-80B - Alternative? (score: 127): Author: 2 at vc.net (rlm); Date: Sun Mar 9 00:23:10 2003; hope the pool of experience can help me but is it a perhaps a parasitic or It's not the fault of Amperex. Eimac and Penta 3-500Zs have the same problem unless appropriate measures are used to decrea; /archives//html/Amps/2003-03/msg00352.html (8,934 bytes)
245. [Amps] Why hasn't solid state replaced tubes? (score: 127): Author: 2 at vc.net (rlm); Date: Sat Mar 8 08:05:39 2003; ** A too familiar story, Tom. One morning about a week after the Challenger "anomaly", I ran across an 80m guru by the name of Roy Neal (the science advisor for NBC). Roy was driving a solid-state a; /archives//html/Amps/2003-03/msg00329.html (9,058 bytes)
246. [Amps] Arcing (score: 127): Author: 2 at vc.net (rlm); Date: Sat Mar 8 07:46:30 2003; transformer On a PBS program I heard 1000V for big ones. They had a video of a crocodile (caiman) who accidently stepped on a big one while he was wading through some shallows looking for lunch. The; /archives//html/Amps/2003-03/msg00328.html (9,424 bytes)
247. [Amps] Arcing (score: 127): Author: 2 at vc.net (rlm); Date: Sat Mar 8 07:29:32 2003; Apples and oranges. The subject is sudden stops. Thus, operating V has nuttin to do with nuttin. The best bait is that which falls into one's lap. cheerz, Tom - R. L. Measures, a.k.a. Rich..., 805.3; /archives//html/Amps/2003-03/msg00327.html (7,785 bytes)
248. [Amps] Arcing (score: 127): Author: 2 at vc.net (rlm); Date: Sat Mar 8 06:20:57 2003; Tom Rauch: Me: When DC current abruptly stops, the potential for reverse potential is impressive. I've measured 400v-pk with an o'scope across 24vdc relay coils. I would like to hear Mr. Rauch's exp; /archives//html/Amps/2003-03/msg00321.html (9,024 bytes)
249. [Amps] Arcing (score: 127): Author: 2 at vc.net (rlm); Date: Fri Mar 7 18:08:08 2003; ** it is my opinion that the counter-EMF spike can be many times the rated primary operating V. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00314.html (9,854 bytes)
250. [Amps] Arcing (score: 127): Author: 2 at vc.net (rlm); Date: Fri Mar 7 13:15:14 2003; ** One of those cherished moments to remember .... - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00308.html (8,285 bytes)
251. [Amps] Rejuvenating glass power tubes (score: 127): Author: 2 at vc.net (rlm); Date: Fri Mar 7 09:44:56 2003; Chortle. Tnx. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00298.html (7,166 bytes)
252. [Amps] Arcing (score: 127): Author: 2 at vc.net (rlm); Date: Fri Mar 7 09:42:39 2003; Some folks know to short another winding when measuring a winding's DC-R. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00297.html (8,379 bytes)
253. [Amps] Arcing (score: 127): Author: 2 at vc.net (rlm); Date: Fri Mar 7 05:14:28 2003; Indeed, Marv. I confirmed this with an oscilloscope. The primary V spike is generated by the collapsing field when battery current flow stops in the primary -- i.e., the ignition contact opening, in; /archives//html/Amps/2003-03/msg00290.html (10,246 bytes)
254. [Amps] Rejuvenating glass power tubes (score: 127): Author: 2 at vc.net (rlm); Date: Fri Mar 7 05:14:20 2003; Large thoriated-tungsten filament Ceramic tubes can be restored to full emission by re-carburizing the hot filament with acetylene gas (C^2 H^2). The two carbon atoms in the acetylene molecule combi; /archives//html/Amps/2003-03/msg00289.html (8,662 bytes)
255. [Amps] Why hasn't solid state replaced tubes? (score: 127): Author: 2 at vc.net (rlm); Date: Fri Mar 7 04:05:07 2003; An accurate measurement of linearity with voice modulation would seemingly best involve a bandwidth measurement using voice modulation. However, voice modulation would probably not be a valid test of; /archives//html/Amps/2003-03/msg00287.html (10,616 bytes)
256. [Amps] Arcing (score: 127): Author: 2 at vc.net (rlm); Date: Thu Mar 6 13:42:40 2003; - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00263.html (9,539 bytes)
257. [Amps] Alpha 86 (score: 127): Author: 2 at vc.net (rlm); Date: Thu Mar 6 07:29:14 2003; ** If one learns that 2800v produces a corona that can jump across a 5000v air gap, has one learned good science? Does the corona washer (not the bottle-type) perform as advertised? See Figures 15 a; /archives//html/Amps/2003-03/msg00251.html (8,663 bytes)
258. [Amps] Use of Manual T/R Switches (score: 127): Author: 2 at vc.net (rlm); Date: Thu Mar 6 07:27:49 2003; I have a 500A CCS knife switch that is available for the price of shipping. It weighs c, 8lbs and is ideal for T/R switching on AM roundtables. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,; /archives//html/Amps/2003-03/msg00250.html (7,883 bytes)
259. [Amps] Alpha 86 (score: 127): Author: 2 at vc.net (rlm); Date: Thu Mar 6 07:19:12 2003; Hi, Tom --using a high-potential tester, what are the measured breakdown voltages with and without the corona washer? thanks - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measu; /archives//html/Amps/2003-03/msg00249.html (7,938 bytes)
260. [Amps] Alpha 86 (score: 127): Author: 2 at vc.net (rlm); Date: Thu Mar 6 07:13:51 2003; Thanks. I know about the washer, Phil. I've heard from a number of SB-1000 and AL-80 owners who have experienced toasted bandswitch contacts. In some cases, there have been two toasted bandswitches,; /archives//html/Amps/2003-03/msg00248.html (8,306 bytes)

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