Quote:
Originally Posted by DaveWM
as long as you can get to a point where the focus gets best and then continuing to turn gets bad again then you have a usable range. but as you noted you are almost out of range. I opted to replace the focus divider on mine to get it back more near the center. Sometimes the pot itself becomes an issue with dirty or worn spots making careful adjustment a problem. You can swap the ends around on the pot to get to a better unworn out part if you want to try that.
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I've got a 1971 Zenith 'more than 4' tube hybrid. The focus divider was drifty on mine and the pot was hitting the stop before getting proper results. I figured I could not find a divider and the circuit was simple, so for the first year or two I just added 4.7 Meg (IIRC) resistors (each time optimal focus went outside control range) until there were about three in series with the focus divider. It has been stable with sharp focus in range for a few years now, and it gets a lot of use.