Hi. I suppose you could have posted in the "Early B&W and Projection TV" forum, but here should be fine. I'm surprised no one has chimed in my now.
Sorry, but I'm not familiar with this specific set. Twin turntables you say - interesting
I don't think the condition of the cabinet is that big of a factor - at least not to guys like me that are into restoring stuff. I like them a little beat up - it gives me something to do
I'm not a fan of gutting sets just to sell the audio amps. I'd much rather have a complete set. If I was looking for a tube amp, I'd pull one from a true basket-case beyond repair. My vote is that you restore the entire set.
Yes, there are high voltages present. Any tube gear is going to use several 100 volts. A TV has a circuit inside that black box that kicks in up to around 9,000 volts going to that cap on the picture tube.