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RE: grounding schemes ...

Do you feel the need to separate low and high current returns for the audio circuit?

A cathode is higher current than a grid; if they are of the same tube section then no- because you want the differential effect of the tube to cause it to be unable to amplify noise. By tying the grid and cathode circuits together and then using a single wire for ground you make this so.

With other circuits I run a separate wire for ground if dictated by the circuit to prevent ground loops. Star grounding can get tricky and you don't have to do it. But in tube circuits it can work really well.

"On no account should any part of the audio circuit ground tie to chassis, since that is grounded into the wall by the power cord."

So the audio circuit returns should not reference chassis ground?
Correct. You can install a resistance or the like between the two so the audio circuit 'floats' at chassis potential. The 'resistance' should be high enough impedance so that a significant ground loop won't form. If a resistance, 100 ohms is more than enough!

Are you connecting power supply returns to the chassis?
No- since they are the audio circuit ground.



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