• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Problem with tube overheating. PLEASE HELP

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NotInTheMafia

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Joined 2002
#1
Ok, here is my problem. I have built the plasmatweeters at http://plasmatweeter.de The el509 gets red quick. (@about 110ma current draw) I tried paralelling 2 of these tubes figuring that the curent would be split equaly between them, and it was, just not how i wanted, now the current draw is just about 240ma. Would there be a better tube to use in the RF oscillator section with the audio driver circuit presented. (I have already built the 2 pcb's so changing a resistor value isnt a big deal, but i need to keep this circuit basicaly the same.)

Thanks for your suggestions.
--Tom
 
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