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1. [Amps] Not the Diacrode (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Thu, 27 Aug 2009 19:38:00 -0600; The Diacrode is a decent high power UHF tube, it is a double-ended tetrode, but it has the same transit time effects as a similar "bottom" circuited tetrode. It merely allows placement in the center; /archives//html/Amps/2009-08/msg00564.html (7,628 bytes)
2. Re: [Amps] Not the Diacrode (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Thu, 27 Aug 2009 22:09:19 -0400; Hmmm..filament 20 volts at 1100 amps...I need a larger filament transformer and a room to put it in. <:-))OTOH I guess I'll have to pass as the I doubt the single phase 220 coming in would be up to i; /archives//html/Amps/2009-08/msg00565.html (8,755 bytes)
3. Re: [Amps] Not the Diacrode (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Thu, 27 Aug 2009 20:46:29 -0700; ORIGINAL MESSAGE: REPLY: But you won't need any high voltage DC. The other guy will hear your filament. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contestin; /archives//html/Amps/2009-08/msg00568.html (7,183 bytes)
4. [Amps] Not the Diacrode (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Fri, 28 Aug 2009 09:31:21 -0600; The filament is DC powered. De big tubes often use DC as the filament may mechanically resonate with powerline frequency and short to grid or itself. I heard and old story of Radio France having a pr; /archives//html/Amps/2009-08/msg00576.html (8,208 bytes)
5. Re: [Amps] Not the Diacrode (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Fri, 28 Aug 2009 11:52:51 -0400; Filaments can just as easily be ramped up on ac, this way with no fuss. I have seen ferro-resonant regulator feeding the filament transformer, the size was carefully chosen so the low resistance of; /archives//html/Amps/2009-08/msg00577.html (7,934 bytes)
6. Re: [Amps] Not the Diacrode (score: 1): Author: TexasRF@aol.com; Date: Fri, 28 Aug 2009 12:20:19 EDT; I lost a couple of good TH347 tubes due excess filament current at turn on. I thought there was sufficient turn on current limiting but apparently not. A circuit was devised from readily available pa; /archives//html/Amps/2009-08/msg00579.html (9,430 bytes)
7. [Amps] Not the Diacrode (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Fri, 28 Aug 2009 14:59:38 -0600; Neat idea, once you figure out the size of the iron. I didn't know that an overloaded ferroresonant transformer would drop voltage that much (to a few % of nominal line voltage). I suppose there migh; /archives//html/Amps/2009-08/msg00582.html (9,816 bytes)

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