Tube DIY Asylum

RE: Adjusting Plate Voltage on Preamp Output Tubes

24.205.128.2

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When I change plate voltages, I then measure the change in idle bias current of tube (measure drop across cathode resistor & calculate the current). Normally, if the voltage change isn't too great on the anode plate, the idle current will compensate somewhat and you'll still be in an appropriate idle current operating range. If not, then start playing with the cathode resistor. I measure with no inputs connected and zero volume (if you have control).

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