Re: Contemplated PCL86 push-pull home brew stereo amplifier
Maybe a grid stopper will stop the buzzing. So you could try placing a 1K resistor ('grid stopper') between the control grid of V1a and the wiper of the 500K volume pot. Solder the 1K resistor as close to the tube socket as possible, so that the lead between the resistor and the connector on the tube socket is as short as possible.
Although I'm not sure about this, I get the impression that you didn't build the tone control (yet) and that you only have a 500K volume pot before V1a. If this is true, and if you are going to use only line level sources like CD-players, which have low output impedance, than I think it is better to use a 50K (or 100K) volume pot. Lowering the input impedance of your amplifier could contribute to less noise issues.
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Robert
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