Looking for GAP/R (Philbrick) amplifiers might help. Some of those were
chopper-stabilized and used IIRC Airpax choppers.
Yes, I had though of that. I think, though, that I would be just as
guilty of a crime doing that as I would be taking the tubes out of an
early Tek scope to make an guitar amp. I think that if I got one of
those amplifiers, I'd have to build it a little shrine...
There's one in that auction place right now, too, taunting me.