5G9 DC on Volume pots

[Chuck H]

To expound on what jazz was saying about filtering, you could try branching the power supply by feeding the trem through a 220R resistor and then it's own filter to help isolate it from the rest of the power supply.

As you noted, it's probably not a big issue. It may even be "normal" for these amps. Just carrying on the hypothesis.

[Jazz P Bass]

If the wiggle is at V1 plates, then that Vac wiggle will get through the coupling caps.

It is what it is.

[hylaphone]

Well, it was worth a try..
Thanks for all the ideas!