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Thanks to responders.

1. The buzz goes away when 1st input tube removed. But, of course, so does the signal.

2. The buzz goes away when treble control turned down (not shown in schematic, just "tone" - a model variation apparently).

3. No change in buzz when you go back to 2-prong plug. And then you measure about 64VAC on chassis.

4. I tried testing small capacitors to ground thru parts of the circuit with no effect - except adding noise.

5. The extra 1/4" inputs shouldn't have to be grounded - and it doesn't get rid of the buzz when they are.

6. My touching the chassis lowers the buzz considerably. Maybe just stand there with my hand on it while playing. Just kidding. This is starting to be like phono grounding buzz (something we are all familiar with, esp in DIY.)

Thanks, friends.


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