Well, maybe I'm getting old then. I just re-tubed and biased the thing, and holy crap! It sounds way better even with the original Oxford than my '64 no-logo ever did. Then again, I knew nothing about amps when I owned the '64 and did nothing except replace the power tubes when they failed. Bias pot? I turned it until it sounded good without smoke and flame. Maybe that's why I went through a lot of power tubes... Hahahaha!
I'm gonna do the bias test point thingy. No sense making a great amp sound like something it's not. So how do you read plate voltage without pulling the chassis?
The "Destroy all Humans" switch is still VERY enticing.

Thanks for that, Ben!