Admiral T102 scored

[bandersen]

Here are the final modifications I went with. I rewired the power switch as Big Dave suggested.
It runs cooler now and B+ is dead on.


I mounted the new components on a terminal strip near the AC interlock.

[Tubejunke]

Originally Posted by bandersen

.
It runs cooler now and B+ is dead on.

Do you mean that the set as a whole runs cooler? Also, what do you think was keeping the B+ below specs and did bringing it up provide any noticable performance improvement?

[bandersen]

Originally Posted by Tubejunke

Do you mean that the set as a whole runs cooler? Also, what do you think was keeping the B+ below specs and did bringing it up provide any noticable performance improvement?

Well at least one corner of it is cooler. That's where I've replaced the 20W filament dropper with a diode.

The old seleniums were keeping the voltage down. They got noticeably warm during operation. I suspect their resistance has increased over time.

As for performance - it's a mixed bag. I can get a brighter picture now, but the contrast isn't as good. Also the vertical retrace lines are more visible. The horizontal sync is still flaky like it has been since I first powered up the set. I suspect I need to replace the dual selenium AFC rectifier. The important thing is that i can stop worrying about the seleniums go up in smoke while I continue tweaking the set. I've had it happen once before and don't ever want to experience that again

I'm also checking the resistors more thoroughly than I did first time around. I'm considering replacing the germanium video detector diode while I have the set open too.