In Reply to: RE: DHT heater specs. posted by Caucasian Blackplate on October 17, 2014 at 22:12:31:
Hello,
None of the above :-) It is for the russian 6P21S. Normally i prefer AC but this is an amp for electrostatic headphones and those are mercyless - Any trace of hum is heard.
The current source is a simple LM117 job, with a "standby" setting, taken from Morgan Jones's book. I hooked to a computer-type switching PS's 12V supply. to reduce the power waste. The current source circuit wastes as much power as the tube :-(
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Follow Ups
- RE: DHT heater specs. - jorisdallaire 23:06:50 10/17/14 (2)
- RE: DHT heater specs. - Paul Joppa 16:34:29 10/18/14 (1)
- Cute indeed! - jorisdallaire 12:35:59 10/19/14 (0)