If you want an all tube set look for the 14" & 16" Zenith. Easiest to
deal with & best built.
Still quite common. Avoid GE's for now.
If you want solid state common sizes are 13" & 17". Avoid Sonys from
the 70's. 13" & 17" Zeniths a best bet.
There are tons out there you just gotta get creative. Example is go to yard sales in old neiborhoods & ASK !
BTW this stuff is almost always worth ZERO ! In fact you save them $$ by taking it away for free.
73 Zeno
LFOD !