Re: EL or PL509 as an audio output valve.
Have a search of some of the audio forums such as diyaudio, you'll find a few examples. Many years ago I built a single ended PL509 amp, fixed bias and driven from g1 - needed about 100Vpp+ if I remember. I've not come across driving the PL509 from the screen though; what is the advantage for audio?
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