The last single-knob varactor tuned Zenith's?

[zeno]

Originally Posted by radiotvnut

13KC10 would be a vertical chassis chromacolor II from the '79 model year.

Yup last year for it.
No easy way to tell the last selector model. Line folders
didnt have S & T models or institutionals. We got some
S & T spec sheets but only ones we could buy. I am
willing to bet that the last one was a 19" institutional set
though. Never got sheets on them, the sales were made
by a rep at the distributor only, we just got a small
"consideration" for a referal.

73 Zeno