Actually, I talked to an older TV guy who said he knew of no cancer cases w.r.t. color TV.
Realize, it's not just color sets that do it, though they got the attention. Typically, anything above 16kv absolute potential was considered to be good for it.
From what I understand, even color sets are at the low low low end of the spectrum - low energy and it can't go far anyway. I'd be more worried about zapping yourself
BTW, I *think* NTE still sells those solid state HV rect plug ins, and at least that cuts 2 sources out of it...
IIRC, the metal shield can around the tubes itself is beyond sufficient for shielding.
I've seen dark 6BK4s and a few dark 3A3s. Never saw a 2AV2 or such, though. I don't think dark = wasted, but it's a good sign the tube's been around the block a few times...
Hey, anyone remember all the fun 'fixes' that happened in the 70's and the fun failures of them?