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Total 6 documents matching your query.

1. [Amps] DC heater supply or AC heater supply (score: 1): Author: "Geert Hofman" <Geert_Hofman@Jabil.com>; Date: Tue, 18 Jan 2005 12:52:12 -0500; Reading through the various reference works, I see that most tubes are heated with AC. However just went through AG6K's docs on amplifiers as well as a recent update of a GS35 design from a French am; /archives//html/Amps/2005-01/msg00352.html (6,811 bytes)
2. Re: [Amps] DC heater supply or AC heater supply (score: 1): Author: "Harold B. Mandel" <ka1xo@juno.com>; Date: Tue, 18 Jan 2005 13:42:28 -0500; Dear Geert, The HF amplifier just finishing up here uses two 3CPX1500A7 triodes that consume 22 amperes at 5.00 volts on the paralleled filaments. As the filament design uses a fully floating supply; /archives//html/Amps/2005-01/msg00354.html (9,236 bytes)
3. Re: [Amps] DC heater supply or AC heater supply (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Tue, 18 Jan 2005 19:40:25 -0000; I can understand how dc on a directly heated tube might introduce some effects, but I can't see that it makes any difference on the heater of an indirectly heated cathode (maybe hum issues in an audi; /archives//html/Amps/2005-01/msg00355.html (8,218 bytes)
4. Re: [Amps] DC heater supply or AC heater supply (score: 1): Author: Joe Isabella <n3ji@yahoo.com>; Date: Tue, 18 Jan 2005 12:28:19 -0800 (PST); I've always thought that both are filaments, it's just that in some applications one is also a directly heated cathode... And yes, my 3-500ZG anodes glow quite nicely, too!! :-) Joe, N3JI I can under; /archives//html/Amps/2005-01/msg00356.html (9,119 bytes)
5. Re: [Amps] DC heater supply or AC heater supply (score: 1): Author: G3rzp@aol.com; Date: Wed, 19 Jan 2005 01:55:12 -0500; I like the idea of a DC heater supply. However, there seems to be no information available on the effects of metal migration in the heater/filament, which, considering the currents involved and the t; /archives//html/Amps/2005-01/msg00361.html (7,340 bytes)
6. Re: [Amps] DC heater supply or AC heater supply (score: 1): Author: "donii@sympatico.ca" <donii@sympatico.ca>; Date: Wed, 19 Jan 2005 09:00:17 -0500; Peter What if you would reverse the DC polarity 60 times a second to make sure no there permanent effcets on the cathode? Now lets see, how can I produce a polarity change every 1/60 th of a second..; /archives//html/Amps/2005-01/msg00362.html (7,851 bytes)

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