Zenith delta gun CCII and RCA Colortrak

[zeno]

Some of these sets did have annoying intermittents. Probably
related to environment like smoke, greasy cooking etc.
Fixed them by soldering in all transistors & IC's, sand down
contact pins for modules. Also bent in the tiny fingers on
the modules for better contact & sprayed them down.
G-2 controls got bad spots & sometimes the chromatic switch
got touchy. A 330 ohm on the 9-90 would give int. problems
when first going, same thing on 9-57 flat chassis. Upgrade to
a 1 watt film. Also a 1.5 ohm in the H. out base on rear of chassis.
The bottom chassis still uses ground lugs so watch that.
For tuner drift ground the AFT white/blue wire at tuner. If
still drifts its the tuner. If not the 150-190 IF strip or switch.

73 Zeno

Originally Posted by Electronic M

The joke in my post was misinterpreted...I've never had the back off mine, and it does not appear to EVER ave been removed in the set's lifetime. It produces a wonderful picture, but the grayscale wanders, the fine tuning drifts, vertical rolls occasionally, and some horizontal streaks occasionally appear...It can be annoying, but has never necessitated me pulling the back. I've always wanted to pull the back to re-seat the modules, spray contact cleaner and touch some service adjustments (which is probably all it needs), but am too lazy...All it needs when it acts up is a slap or two on it's side or for me to kick the bench it sits on, and usually it behaves its self for a satisfactory interval.

I might take Jim up on his taunt. Of the 2-4 times in the last 4 years my bench has been it's cleanest/most organized that photo is one of them. ....Actually I can't quite take Jim up on that since I've shifted the mess around since he saw it, and could not recreate the EXACT state he saw it in to save my life.