07-11-2016, 11:58 AM
So here's the problem, pin 6 is the control grid of the 50A5. If you connect the .22 to it and the chassis it passes most of the audio to ground. Remove that .22 from pin 6 and connect it from B- (- side of the filter) and the other end to the chassis as per the schematic. Leave the .01 and the 470k resistor.
Terry
Terry