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Do It Yourself (DIY) paradise for tube and SET project builders.

A couple of suggestions

First, ground the faceplate to the chassis.

Second, I would not directly run a wire between the circuit ground (power supply caps) and the chassis- that will open the amplifier to ground loops. Instead, a simple way to do that would be to put a 50 ohm resistor between the chassis and power supply ground, so that a ground loop current can't form but the circuit is still floating at ground potential.

A more sophisticated method would be to also install 2 rectifiers in parallel but in opposite directions to each other and then in parallel with the resistor. This will prevent the chassis from going too far afield should there be some weird problem like a component elsewhere in the system introducing line voltage to the circuit ground of the amp. The diodes will cause a fuse to blow somewhere if things are rated correctly.

I think you will find that this approach is actually quieter than what you've got going on right now.

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