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RE: DHT heater specs.

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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  • RE: DHT heater specs. - jorisdallaire 23:06:50 10/17/14 (2)

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