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RE: Dynaco Pas Hum

That's a big help. The designer probably assumed stock phono board, which has pin 9 grounded.

Leave unit powered off 10 minutes or so no chance of accidental capacitor discharge (shock). Check resistance from pin 9 on the phono board, to the connection marked ground. Do it for both tubes, have your volt/ohm meter set to the lowest resistance. If it measures open, I suggest you add a wire from either of the pin 9's to where it is marked ground (left side of board in picture).


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