Hey, spr, doesn't seem to be room for a reply in the "vintage amps" thread - thought I'd write to you here. Your twin's sound got thinner with two fewer tubes? That's a shame! Mine - somehow - became deeper and thicker sounding, a little softer in the way it feels and at the same time, more responsive. I was hoping your amp would open up the way mine has. But mine was in bad shape, and a good candidate for blackfacing, and some upgraded diodes; the reverb is on both channels ... the amp guy I go to knows a lot about how to get these amps singing. I hope you find another solution - when a Twin is working the way you want it to, it's hard to beat. As I'm sure you know. Best of luck with it. Take care!
(... we did talk about this in some other thread, some time ago, didn't we? If not, I apologize for mis-remembering and wish you best of luck anyway.)