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341. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 15 Apr 2001 21:25:38 -0400; It is last because the voltage is too high for it to be "first". Hopefully it is last, and not the socket! Ian, the impedance is normally in the anode. I doubt that will happen with any large impeda; /archives//html/Amps/2001-04/msg00348.html (9,781 bytes)
342. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 15 Apr 2001 21:25:38 -0400; I think some of us are making a simple circuit more complex than it needs to be!! Why build the regulator so semiconductors handle nearly full anode voltage, plus have a response time in nanoseconds; /archives//html/Amps/2001-04/msg00349.html (9,297 bytes)
343. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 15 Apr 2001 21:25:38 -0400; 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesti; /archives//html/Amps/2001-04/msg00350.html (8,904 bytes)
344. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 16 Apr 2001 20:28:39 -0400; I've drawn a few arcs with my hands, but like Rich I've never arced inside either. Tetrodes are a different story. They do arc inside on occasion, for the same t reasons triodes and other vacuum tub; /archives//html/Amps/2001-04/msg00373.html (9,067 bytes)
345. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 17 Apr 2001 07:28:14 -0400; It extends beyond the use of a ruler. He uses a grid dip meter to measure impedance and Q. All of this goes back to his claims that parasitics are a major cause of component damage. Without inaccura; /archives//html/Amps/2001-04/msg00386.html (9,623 bytes)
346. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 17 Apr 2001 09:50:41 -0400; Assuming you have a big blocking capacitor and bypass capacitor, it helps start the glitch going. The RF chokes and tank components are the major components that limit initial current that charges t; /archives//html/Amps/2001-04/msg00390.html (9,731 bytes)
347. [AMPS] basic question about dipping the plate (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 22 Apr 2001 21:51:04 -0400; Because the anode impedance is maximum at that point. That means the time-varying resistance of the tube has less current through it, since it is pulling on a higher impedance load. 73, Tom W8JI W8J; /archives//html/Amps/2001-04/msg00483.html (8,617 bytes)
348. [AMPS] basic question about dipping the plate (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 23 Apr 2001 10:15:51 -0400; No it isn't, unless like Rich you don't use the term in a conventional manner. The pi-network matched system IS resonant when the network is properly adjusted. Resonance is defined (except in certai; /archives//html/Amps/2001-04/msg00492.html (10,691 bytes)
349. [AMPS] basic question about dipping the plate (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 23 Apr 2001 10:15:51 -0400; We view it that way because that is how the network behaves. If you moved along the inductor measuring voltage to ground with a RF voltmeter, you would see voltage at some point in the network is LO; /archives//html/Amps/2001-04/msg00493.html (10,753 bytes)
350. [AMPS] basic question about dipping the plate (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 23 Apr 2001 10:15:51 -0400; Rich has his own definition of "resonant". He also has a grid dip meter that, unlike every other grid dip meter in the world, measures impedance and Q. So while what you are saying is technically co; /archives//html/Amps/2001-04/msg00494.html (10,005 bytes)
351. [AMPS] basic question about dipping the plate (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 25 Apr 2001 15:28:59 -0400; Only when the components stand alone. The way a network or SYSTEM is defined as resonant is when voltage and current are either in-phase, or 180 degrees out-ofphase. The L network and pi-network are; /archives//html/Amps/2001-04/msg00530.html (9,442 bytes)
352. [AMPS] Buffer/Driver Stage for 4-1000 Amp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 27 Apr 2001 14:28:16 -0400; I don't know why you say that! When I totalled the results, at 4Kv you WON'T make 1500 watts output. You will barely get over 1500 watts with a 3CX1200 or a 3-1000Z, which have more gain than a 4-10; /archives//html/Amps/2001-04/msg00557.html (8,669 bytes)
353. [AMPS] YC-156 Cathode/Filament question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 29 Apr 2001 23:11:44 -0400; One thing to remember about the 3CPX5000/ YC156 is if you use the same filament choke for the cathode connection as for RF you will likely pick up some low level hum from AC voltage drop in the filam; /archives//html/Amps/2001-04/msg00576.html (7,269 bytes)
354. [AMPS] YC-156 Cathode/Filament Circuit (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 30 Apr 2001 21:33:34 -0400; That will work Jeff, and it is the easiest way. With your system, none of the AC filament current will flow through the bias choke. Filament related hum will NOT modulate the signal doing it that wa; /archives//html/Amps/2001-04/msg00588.html (7,270 bytes)
355. [AMPS] stupid question (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 16 Mar 2001 12:37:17 -0500; RCA connector is something that has crept into common usage. I don't know where it came from, it has gradually appeared. Many names are like that. There are is a special type of plug that looks like; /archives//html/Amps/2001-03/msg00146.html (9,059 bytes)
356. [AMPS] SB-220 Amplifiers and Garage Sales!! (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 23 Mar 2001 08:25:50 -0500; Are you guys playing Rich's word games again? Wes, the person who made the measurements, concluded there was no advantage to using nichrome. Rich, despite making an agreement to not "cook" Wes' data,; /archives//html/Amps/2001-03/msg00212.html (12,077 bytes)
357. [AMPS] SB-220 Amplifiers and Garage Sales!! (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 23 Mar 2001 10:37:03 -0500; Despite your pointed insult to Jon and his abilities, you are the one who is incorrect Dave. The anode-to-grid capacitance of a 3-500Z is about 5pF. About 1100 ohms on ten meters. With a tank-voltag; /archives//html/Amps/2001-03/msg00215.html (9,977 bytes)
358. [AMPS] Problem with Ameritron AL-82 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 25 Mar 2001 07:21:54 -0500; Virtually 100% of the time this is caused by the T/R relay being too slow in the amplifier, or the rig "hot-switching" by outputting RF before it tells the amplifier to "turn on". It is a virtual ce; /archives//html/Amps/2001-03/msg00248.html (8,676 bytes)
359. [AMPS] Problem with Ameritron AL-82 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 25 Mar 2001 11:38:47 -0500; This makes me wonder. My FT1000D has dropped the switch lead a three times now, and while it was on the way out it did something similar to what Mike described except on many occasions it would NEVE; /archives//html/Amps/2001-03/msg00253.html (8,568 bytes)
360. [AMPS] FT-1000D/AL82 relay (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 26 Mar 2001 09:24:41 -0500; My suggestion would be to troubleshoot the problem, before reaching any conclusion. It would not be difficult to measure the resistance of the relay line when pulled from the BACK of the amplifier...; /archives//html/Amps/2001-03/msg00267.html (7,403 bytes)

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