K&K Audio / Lundahl Transformers

RE: AC/DC heating with series feed

68.221.38.113

In Reply to: RE: AC/DC heating with series feed posted by KurtP on October 10, 2007 at 05:43:11

AC heating has proven to be adequate for 6N6Ps in the line stage. Broadband noise dominates the output noise of the line stage, so hum from the filament supply is a non-issue.

I also supply the 300B filaments in the Art Audio Vivo with AC. I use a 5 ohm wirewound pot flanked on either side with a 20 ohm resistor to provide hum balance and a cathode resistor connection point. The hum from the Vivo in my Ariels is so small that I can't hear it until my ear is 6" from the mid-woofer cones. It's a big deal to make a quiet DC supply for high current indirectly heated filaments and AC works very well.

Kevin Carter
K&K Audio
www.kandkaudio.com

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RE: AC/DC heating with series feed - KurtP 10:15:59 10/10/07 (0)

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