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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Hum and buzz - they are totally screwing up your sound. posted by arend-jan on January 21, 2007 at 02:57:51:
My 211 SET drives the filament with a 65 kHz squarewave. To my ears, there are no sonic drawbacks. To minimize the possibility that certain sources might create audible IM products, I hope to eventually increase the frequency to 150-200 kHz, and to smooth the wave using 2nd and 3rd harmonic traps.I have compared this approach to both 60 Hz heating and DC. DC was quiet, of course, but lacked the "air" of the two AC designs. I chose an ultrasonic supply, but in fact I would put up with the 120 Hz floor generated by a line-driven filament before I would consider accepting the loss of nuance that occurs with DC.
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Follow Ups
- Ultrasonic Filaments - Triode_Kingdom 19:04:54 01/21/07 (1)
- To minimize the possibility that certain sources might create... - Allen Wright 06:12:31 01/22/07 (0)
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