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1. [Amps] tube fils..again (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 16 Jun 2012 06:23:41 -0700; The idea of slowly raising the voltage on a tube filament upon "turn on" remains a disputed area (to do or not to do, that is the question). Check out what a new 3CX-3000A7 or 6000A7, etc cost.... an; /archives//html/Amps/2012-06/msg00203.html (8,670 bytes)
2. Re: [Amps] tube fils..again (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Sat, 16 Jun 2012 09:10:34 -0700 (PDT); I was thinking about this last night. AC is hard to regulate. Has anybody thought of running filaments off DC? DC is easy to regulate. Cheap switching power supplies can deliver large amounts of effi; /archives//html/Amps/2012-06/msg00206.html (7,230 bytes)
3. Re: [Amps] tube fils..again (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Sat, 16 Jun 2012 09:46:01 -0700 (PDT); ** Not insurmountable. A dpdt relay driven by some kind of flipflop could do that. - Jerry _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2012-06/msg00208.html (7,062 bytes)
4. Re: [Amps] tube fils..again (score: 1): Author: Dave White <mausoptik@btinternet.com>; Date: Sat, 16 Jun 2012 20:27:33 +0200; I've known plenty of people use ex-computer 5V DC switch mode supplies for the heaters on oxide cathode tubes like 4CX250Bs (G6ABU used them for years in his 2 metre contest amps) - probably because; /archives//html/Amps/2012-06/msg00212.html (8,356 bytes)
5. Re: [Amps] tube fils..again (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 16 Jun 2012 14:32:07 -0400; CL type Thermistors are fine as long as they are run within their MINIMUM and MAXIMUM current ratings. Choose wisely. Carl _______________________________________________ Amps mailing list Amps@conte; /archives//html/Amps/2012-06/msg00213.html (10,018 bytes)
6. [Amps] tube fils..again (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Sat, 16 Jun 2012 14:42:33 -0600; Some large power tetrodes and triodes require DC due to the risk of vibration of the large filaments at 120 Hz. AC filaments are pleasant to deal with as usually a center tap on the filament transfor; /archives//html/Amps/2012-06/msg00214.html (10,925 bytes)
7. Re: [Amps] tube fils..again (score: 1): Author: Jerome Kaidor <jerry@tr4.tr2.com>; Date: Sat, 16 Jun 2012 10:03:06 -0700 (PDT); ** OK, as long as it doesn't have to be sine-wave AC, it's easy. Guess square waves are OK... How about the PWM output off a PIC? - Jerry _______________________________________________ Amps mailing; /archives//html/Amps/2012-06/msg00261.html (8,201 bytes)

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