1975? Zenith Chromacolor II model G4550P

[zeno]

I used to HATE doing those damn springs. Then one day the boss
was doing a house call on a junker & he put a few drops of WD40
on each one. Fixed it & from then on we had 100% cure rate on
them with no risk.
The one nobbers were OK for the Boston market but a place like
Hartford you needed mostly UHF. IIRC there was a mod to change
them to 6 VHF & 12 UHF but dont remember the details. The
slide rule varactor selectors get around the problem.

73 Zeno
LFOD !

Originally Posted by DavGoodlin

That's a great save, the CRT alone is money in the bank. I sold many of these after they started appearing curbside at 10-11 years old. There were usually very minor issues and of course, I replaced the HV hold-down capacitor. The 1974-78 models were ALL dependable and rugged, I even relocated the CRTs-chassis into older cabinets.

Those one-knob varactor tuners were the only annoying issue, especially when you NEEDED UHF. I forget what worked on them. The turret tuners were an issue too, along with the detent UHF tuners, that needed the shaft grounding springs cleaned.