wa2ise
Super Member
Had this idea for a cathode follower using directly heated triodes (the smaller ones, like those used in battery operated portable radios or hearing aids. Ones with specified + and - filament terminals). Fed by large resistors from high voltage + and - to approx constant current sources, and also to look like a 1K load. If I wanted 1K follower load, and the filament wants 50ma at 1.4V, I'd need a 2K resistor fed by 100VDC supplies on both sides (+100V to 2K, to filament, to another 2K resistor to -100V). Well, that could be done, but would burn a fair amount of power (10W). Well, if I did that, would I get any "DHT magic" from this cathode follower?
