Saved an '88 RCA color from the curb

[radiotvnut]

That would have to be one of the last knob tuned RCA's and probably uses a CTC135 chassis. I have the '87 GE 19" version that uses a CTC136 chassis. The CTC135/36 were the last decent ones before Thomson took RCA/GE down the toilet. GE bought RCA in '86 and within a couple of years, they handed the whole thing over to Thomson. So, yours could very well be a Thomson-era TV.