Well, I hope it doesn't change the OP's mind, but one of the Westinghouse 7591's in my 800C redplated last night. I'm hoping it's just a faulty tube, as I had the thing professionally-restored last year by a tech who specializes in classic tube gear and consoles (and he did give me an extra pair of n.o.s. WH 7591's). But if it's gotta' go under the knife at all, it's gonna' be a drag because I'm trying to save up for a Marantz 8b.
That said, I still love my Fisher. I really dig the look, plus they're such a good match for my main speakers. I haven't been in the vintage game long enough yet to put together a good supply of backup gear. The maintenance gets expensive, and with my main turntable being an old idler-type, it can be hard to keep up with everything. In time though. Once I have the 8b and get that up and running smoothly, it'll be nice to have a backup tube model in case one or the other goes down.
Dang it. I miss the thing already. Normally, I'd be listening to music right now while I eat breakfast, but today I'm stuck listening to the voices in my head (One of them says 'Hi' by the way).