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241. [Amps] Swan Mark 1 (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Sat, 15 Jun 2013 15:48:04 -0600
Eimac quit making them over a decade ago, and they were superceded. Then, of course, they got out of the glass triode business entirely. 3-400Z equivalents are still made, from the Covimag factory in
/archives//html/Amps/2013-06/msg00226.html (8,550 bytes)

242. [Amps] testing the biggest one (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Fri, 2 Aug 2013 13:09:56 -0600
I just concluded 3 days of observing the final testing of a new tetrode in the French Thales (former Thomson) factory. I can say with first hand experience that tubes will be around for a long time,
/archives//html/Amps/2013-08/msg00004.html (8,096 bytes)

243. [Amps] Testing the biggest of them (score: 1)
Author: Jtml <jtml@losalamos.com>
Date: Wed, 31 Jul 2013 18:41:46 +0200
I just concluded 3 days of observing the final testing of a new tetrode in the French Thales (former Thomson) factory. I can say with first hand experience that tubes will be around for a long time,
/archives//html/Amps/2013-08/msg00055.html (8,200 bytes)

244. Re: [Amps] Amps Digest, Vol 128, Issue 4 (score: 1)
Author: Jtml <jtml@losalamos.com>
Date: Sat, 03 Aug 2013 10:49:07 -0500
The TH628 is not a 200 kW HF tube. It has produced 1 MW continuous at 200 MHz. At HF, or 35-60 MHz specifically for heating fusion reactions, 1.7 MW seems achievable. No SW broadcaster (besides some
/archives//html/Amps/2013-08/msg00056.html (37,034 bytes)

245. [Amps] High power combiners (score: 1)
Author: Jtml <jtml@losalamos.com>
Date: Thu, 12 Sep 2013 09:10:36 -0600
Werlatone is one of the best sources for high power broadband couplers and combiners. Its where many commercial manufacturers go. Might be too pricy for amateur work. 73 John K5PRO Sent from a Motoro
/archives//html/Amps/2013-09/msg00077.html (6,591 bytes)

246. [Amps] Other HV rectifier diodes (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Wed, 25 Sep 2013 18:35:22 -0600
In addition to the high voltage diodes 6A10 mentioned earlier, rated for 1 kV PIV, 6A DC and 400 Amp surge, another useful part for high power is the M7P5 from Edal Industries. These are rated 1.5 kV
/archives//html/Amps/2013-09/msg00304.html (6,729 bytes)

247. [Amps] Testing high power stuff with floated mains-powered scopes (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Fri, 04 Oct 2013 13:07:14 -0600
Years ago an engineer at work floated one of our then brand new HP Jedi scopes (HP 56605A I think) to capture the peak current through the crowbar device in a 30 kV 125 uF capacitor vault. They conne
/archives//html/Amps/2013-10/msg00023.html (8,797 bytes)

248. [Amps] Solid state or tubes for HPAs (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Fri, 04 Oct 2013 13:12:12 -0600
Wednesday at the North American Particle Accelerator Conference in Pasadena, I presented my poster on the merits and problems of choosing transistors, IOTs, klystrons or tetrodes for VHF HPAs. The en
/archives//html/Amps/2013-10/msg00024.html (7,518 bytes)

249. [Amps] Bleeder resistor across screen grid terminal (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Thu, 28 Nov 2013 18:08:19 -0700
Weeks ago here there was some discussion on the merit of having a shunt resistor to ground from the screen grid of a 4CX1000A. The reason that was most posted was to prevent disconnection of the scre
/archives//html/Amps/2013-11/msg00432.html (10,553 bytes)

250. [Amps] PARALLEL CAPS IN OUTPUT and using Mr. Smith's chart (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Sat, 07 Dec 2013 21:24:23 -0700
Fellow amplifier builders, The kind of analysis described below, using transmission line analysis, or the shorthand version, the Smith Chart, is something that we all should be familiar with, as circ
/archives//html/Amps/2013-12/msg00064.html (9,965 bytes)

251. [Amps] GS35B Idle Current drifting up (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Sun, 22 Dec 2013 20:49:17 -0700
I've seen indirect heated planar triodes from Eimac Salt Lake products that had similar damage. The spacing in those tubes from grid to cathode is very close. Bombardment of the cathode from ions wou
/archives//html/Amps/2013-12/msg00147.html (7,793 bytes)

252. [Amps] "N" Connector (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Sat, 28 Dec 2013 20:12:11 -0700
When I came into my current job, there were some cavity amplifiers using RCA 7651 tetrodes, running 5 kW pulsed power, about 600 watts average. This was at 200 MHz. The N connectors on the input to t
/archives//html/Amps/2013-12/msg00165.html (9,456 bytes)

253. [Amps] Runaway Plate Current (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Mon, 30 Dec 2013 22:58:24 -0700
This is what I do in amplifiers at work. One tetrode runs with 1200 VDC on the screen grid all the time, and 12 kV on the anode. Control grid is normally -250 VDC for quiescent current for linear amp
/archives//html/Amps/2013-12/msg00219.html (9,712 bytes)

254. [Amps] ?negative screen current (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Tue, 31 Dec 2013 12:47:44 -0700
WA4LAV's explanation agrees with what I have read and heard talking to tube manufacturers. A lot of information can be gleaned from papers in the archives of IRE, IEEE, AIEE, Wescon meetings, and so
/archives//html/Amps/2013-12/msg00241.html (12,786 bytes)

255. [Amps] High current RF decoupling capacitors (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Sun, 05 Jan 2014 01:05:34 -0700
I suggest the ATC series of flat strip multilayer ceramic capacitors like these: http://www.atceramics.com/Product/39/900_C_Series_X7R_Ceramic_RF_Power_Multilayer_Capacitors_%28MLCs%29 73 John K5PRO
/archives//html/Amps/2014-01/msg00029.html (7,943 bytes)

256. [Amps] Tour of an Analog TV Transmission Facility (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Sat, 18 Jan 2014 14:12:36 -0700
The narrator/host is an obnoxious sort. I have watched his tear down of a Rigol spectrum analyzer, drove me nuts watching him try and second guess everything, and some of the time he was obviously wr
/archives//html/Amps/2014-01/msg00143.html (9,299 bytes)

257. [Amps] Tour of an Analog TV Transmission Facility (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Sat, 18 Jan 2014 14:28:25 -0700
I watched that Australian YouTube host's tear down of one of the Rigol spectrum analyzers before deciding to get a better look with a demo. I got the version that played up to a few GHz for a week. I
/archives//html/Amps/2014-01/msg00144.html (9,160 bytes)

258. [Amps] Reducing grid currents and improving gain (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Mon, 20 Jan 2014 01:35:42 -0700
A little tube history here: RCA designed and manufactured beam power tetrodes such as the 6L6, 807, and 829B to increase power output, allowing the plate voltage swing to go lower without a large inc
/archives//html/Amps/2014-01/msg00176.html (10,207 bytes)

259. [Amps] MOVs (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Sat, 25 Jan 2014 23:05:56 -0700
I have had a pair of large Harris MOVs across my main panel to neutral and line to line, for 21 years now. They are fed through a double pole breaker and there is a relay that fires a sonarlert if th
/archives//html/Amps/2014-01/msg00249.html (10,921 bytes)

260. [Amps] Tube swap (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Tue, 28 Jan 2014 00:05:00 -0700
At work we contracted with CPI/Eimac recently to build some pulsed HV switch triodes. We specifically requested they be made from glass and metal and not ceramic/metal. They complied. 73 John K5PRO O
/archives//html/Amps/2014-01/msg00268.html (8,561 bytes)

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