Last year I had a chip go bad in my 10 yr old Sony tv (no replacement parts available).
I actually found an outfit in Cincinnati via eBay that replaced the failed chip on the board for 40 bucks. Apparently this is a well known common failure for these sets.
Brought back memories.
We still deal with tubes in the musical world. Tube amps are still popular with guitarists who do the classic rock sound. So even new tube amps and of course replacement tubes for old amps are still available. I think it is one of the only niche uses for tubes still around.