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141. Re: [Amps] Maximum tolerable SWR for dual 3-500Z amps (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 20 Nov 2003 04:36:01 -0800
** If the tank Tune-C and Load-C are not at the stops, the amplifier tubes will not know the difference. _______________________________________________ Amps mailing list Amps@contesting.com http://
/archives//html/Amps/2003-11/msg00293.html (7,393 bytes)

142. Re: [Amps] Pin Diodes questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 20 Nov 2003 04:36:02 -0800
** To protect PIN diodes from lightning, when finished operating, unplug the feedline from the amplifier and toss it out the window on the ground. The feedline should not come within 10-ft of the ho
/archives//html/Amps/2003-11/msg00294.html (8,738 bytes)

143. [Amps] Secondary winding R of Dahl xfmr? (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 20 Nov 2003 10:03:33 -0800
Does anyone know the secondary winding R of the Peter W. Dahl 3000V, 1.5A transformer? This tranformer weighs c. 68-pounds. _______________________________________________ Amps mailing list Amps@cont
/archives//html/Amps/2003-11/msg00295.html (6,703 bytes)

144. Re: [Amps] Question for R. Measures (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 21 Nov 2003 01:39:55 -0800
amplifiers when 's and tie ** Since c. 75% of the grid current in a G-G connected-tetrode flows in the control grid, and the 4cx800A has a 2w grid -- which is plenty for Class AB1, I would not opera
/archives//html/Amps/2003-11/msg00306.html (7,914 bytes)

145. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 21 Nov 2003 01:39:56 -0800
** Beats me, Bill, but stacked hydrogen thyratrons sounds likely. When the Sylmar inverter fired up for the first time, the RFI problem was cataclysmic. Screen-shielding eventually solved the proble
/archives//html/Amps/2003-11/msg00307.html (8,749 bytes)

146. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 21 Nov 2003 01:39:57 -0800
** But not for long-distance power transmission. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2003-11/msg00308.html (8,834 bytes)

147. Re: [Amps] AC or DC better for indirectly heated cathodes? (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 21 Nov 2003 07:03:06 -0800
could at to ** So why not follow the tube manufacturer's recommendation? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis
/archives//html/Amps/2003-11/msg00312.html (9,516 bytes)

148. Re: [Amps] Benefits of 3-phase power? (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 22 Nov 2003 03:31:54 -0800
** Thanks, Marv. It's amazing that a Si thyristor-valve stack can switch 500kV at 2kA. This is undoubtedly some serious "QRO". Sylmar is probably using the same technology. _________________________
/archives//html/Amps/2003-11/msg00313.html (9,107 bytes)

149. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 22 Nov 2003 20:42:53 -0800
** Not unless you use a string of forward biased Si diodes instead of the zener. . ** the meter accuracy have been compromised. I would check the accuracy with a DMM and a low-V supply. ** 2, parall
/archives//html/Amps/2003-11/msg00329.html (7,719 bytes)

150. Re: [Amps] YC156 Tube Pros & Cons (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 24 Nov 2003 05:13:21 -0800
** Free advice. 1. Allow an extra half-minute pre-heat. (George Badger) 2. Do not ground either side of the heater. 3. Connect one side of the heater to the cathode and use a 10 - 15 uH bifilar heat
/archives//html/Amps/2003-11/msg00345.html (8,143 bytes)

151. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 24 Nov 2003 05:13:21 -0800
** Agreed, but anode(plate) to grid arcs are typically the result of loose gold particles , not a ceramic-metal seal leak. According to Eimac's 8877's development team, gold migration is the result
/archives//html/Amps/2003-11/msg00346.html (9,893 bytes)

152. Re: [Amps] warm up times of tubes? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 24 Nov 2003 05:13:22 -0800
** Amen, Norm. Folks who want serious suds in short-order need an 8171. 1-second and you'r airborne. _______________________________________________ Amps mailing list Amps@contesting.com http://list
/archives//html/Amps/2003-11/msg00347.html (7,233 bytes)

153. Re: [Amps] trouble with TT centurion (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 24 Nov 2003 07:23:31 -0800
** There is no such thing as a 0v-potential RF-ground. ** Do you use a coaxial choke balun after the amplifier? http://www.somis.org/bbat.html see figure 1C. ________________________________________
/archives//html/Amps/2003-11/msg00354.html (9,444 bytes)

154. Re: [Amps] Alpha 86 (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 24 Nov 2003 07:32:04 -0800
** Vic -- I would like to buy the old bandswitch wafer from you if you are willing to part with it. I am also looking for kaput 3cx800A7s. tnx - If anyone else has some of these items, please name y
/archives//html/Amps/2003-11/msg00355.html (7,219 bytes)

155. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 24 Nov 2003 09:42:40 -0800
** Gold-evaporation only happens during a VHF or UHF oscillation in tubes with a gold-plated grid. 3cx1200... does not have a gold-plated grid, but in my opinion it can oscillate. . -- Joe Funderber
/archives//html/Amps/2003-11/msg00356.html (7,874 bytes)

156. Re: [Amps] amp. Pi-L tuning question (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 25 Nov 2003 02:56:03 -0800
** For G-G, apply full drive, tune for max output, and one is done. What could be easier?. ** Neither do I. _______________________________________________ Amps mailing list Amps@contesting.com http
/archives//html/Amps/2003-11/msg00361.html (8,021 bytes)

157. Re: [Amps] Alpha 86 (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 25 Nov 2003 02:56:05 -0800
** Tnx, Vic. ** But how did the 160m Load-C padder contacts arc if they were closed? ** The contacts burned while closed? ** Was he using an antenna tuner to match the few-ohm antenna to the 50-ohm
/archives//html/Amps/2003-11/msg00362.html (8,911 bytes)

158. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 25 Nov 2003 08:03:28 -0800
** When I see gold meltballs through a microscope, I see no barium oxide or strontium oxide. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes
/archives//html/Amps/2003-11/msg00365.html (8,722 bytes)

159. Re: [Amps] Alpha 86 (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 25 Nov 2003 08:07:48 -0800
** It's the first time I've ever heard of that trick. ** Alzheimer's? cheers, Vic _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/ma
/archives//html/Amps/2003-11/msg00366.html (7,823 bytes)

160. Re: [Amps] AL-1200 Questions (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 26 Nov 2003 22:26:21 -0800
** I can see their spherical shape only with 30 - 50 X magnification. Otherwise, they look like yellowish dust. [see Fig 24 on my Web site]. I can see the cathode coating, but none of it appears to
/archives//html/Amps/2003-11/msg00380.html (10,041 bytes)

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