I live in Chicago, so there are still some shops left in the big city, though I'm still angry about not checking out the shop I saw closing a few years ago.
There was actualy a TV man located down the street from us, a really nice guy who tried to fix our TV once, but the CRT was bad (no green). Sadly, a few years ago, he retired and moved away, right before I got intersted in old sets.
When he moved he threw away about 15 sets, mostly newer ones with no chassis..., I did the get the Zenith hybrid black and white set that tv beta guy now owns. I know there was a tube color set in there, but it was buried, and I wasn't really intersted in that stuff back then, boy I wish it was there now...
There is actually a shop, called Deltronics, which actually specalizes in repairing ond tube grar, mostly guitar amps and expensive audio items, along with servicing regular new stuff. They fixed up my Grundig radio with a broken coil that I didn't want to deal with. I asked once it they fixed old TVs, and they said no problem, but I havn't brought in a set yet, sicne there is a minuimum charge of about $70.00 on just about everything, now we know why people throw away stuff when it breaks instead of getting it fixed.