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1. [Amps] 60 filament noise (score: 1): Author: StephenTetorka@cs.com; Date: Mon, 6 Feb 2006 10:36:03 EST; Hi all: Might it be possible to apply a high-pass filter to eliminate the 60 Hertz ac power supply noise from getting into my filaments? Also..it is my understand that using a DC filament voltage wor; /archives//html/Amps/2006-02/msg00128.html (6,643 bytes)
2. Re: [Amps] 60 filament noise (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 6 Feb 2006 09:41:49 -0800; For heater-type cathodes or filament-type cathodes? Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http:/; /archives//html/Amps/2006-02/msg00132.html (7,267 bytes)
3. Re: [Amps] 60 filament noise (score: 1): Author: StephenTetorka@cs.com; Date: Mon, 06 Feb 2006 13:18:08 -0500; Hi Rich: Please excuse me for not providing more detail. I made a 1929 Hartley using a 204A Heising modulated with an 849. Both tubes are filament heated with 11 VAC @ 5 amps wiht center tap on 204 f; /archives//html/Amps/2006-02/msg00135.html (8,159 bytes)
4. Re: [Amps] 60 filament noise (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 6 Feb 2006 12:46:13 -0800; DC is okay for heater-type tubes, but for filament types, it is problematic. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list A; /archives//html/Amps/2006-02/msg00138.html (8,793 bytes)
5. Re: [Amps] 60 filament noise (score: 1): Author: StephenTetorka@cs.com; Date: Mon, 06 Feb 2006 16:22:37 -0500; Simple question: regarding my "audio having hummmm" and my 204A is being Heising modulated with an 839...presuming this hum is AC..and this AC is associated with the tube(s) filaments... How is the 6; /archives//html/Amps/2006-02/msg00139.html (9,894 bytes)
6. Re: [Amps] 60 filament noise (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 06 Feb 2006 16:41:45 -0500; In non-linear amplifiers the 60 Hz modulation by the filament is basically cathode modulation. If the voltage applied to a directly heated cathode is not balanced on either side of the filament the e; /archives//html/Amps/2006-02/msg00140.html (11,097 bytes)

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