John, I regretted not using component numbers after I had zipped the email off to Paul. I was referring to the top fixed resistor as Rtop since the pot was a VR. I agree with you completely because I was thinking of the LM317 or 350 all along. But Josh already mentioned the 7824. If I had known it was 5mA,(Are you sure?), I wouldn't have mentioned it. PDs of the reference string resistors start making it more of a PS/Heater. My datasheet didn't show specific values for the 7824. Not knowing the biasing requirements for a given tube, I thought tying to the Regl output might be pinching off too much. I was wondering if a little R in parallel with the triode might not be good as well.
So do we agree that with the LM317 or LM350 and a suitable triode, Josh might pull it off? I haven't read any tube data in over a decade. What about the possibility of a little R between the cathode and regulator input to set I limit and help with grid biasing?
Joe
[This message has been edited by JoeTestingEngr (edited 10-10-2006).]
