1963 RCA CTC-15 roundie

[Electronic M]

Sometimes the 3.58 osc. just needs a tweak one of my roundys would take ~1/2 hour to have it's color synch, work for a few hours then flake out again. Tweaking the osc. slug while messed up cured the issue.

[etype2]

Originally Posted by Electronic M

Sometimes the 3.58 osc. just needs a tweak one of my roundys would take ~1/2 hour to have it's color synch, work for a few hours then flake out again. Tweaking the osc. slug while messed up cured the issue.

That was the problem. After operating the set for about 2 1/2 hours, the color faded out again, so while the set was in this condition, we removed two suspected tubes and let them cool down one at a time. After cooling down, we placed them back in the chassis and the color returned briefly and faded again. Next, we replaced the suspected 6GH8A OSC. tube with a new one and the problem persisted. Next, we adjusted the 3.58 Oscillator slug and saw a big improvement. Further tweaking and the color remained stable. We think we solved the problem and left the original 1963 coded 6GH8A installed and we still have a 100% original CTC-15.