CTC-4 Director 21

[Phil Nelson]

Definitely do not rejuvenate the CRT at this point. Too easy to kill the tube, and what you're seeing on the screen may be normal for a CTC-4 that's chock full of bad caps. A working television will tell you more about a CRT's condition than any tester.

I agree with old_coot88, that pop sound could be arcing, and the cutout in the CRT metal retaining ring is an obvious place to look. If you run the TV briefly in a completely dark room, you might even see the zap occur along that dark track seen in the photo.

When I installed a glass CRT in my set, I made a smaller cutout in the ring, but I also covered the nearby edges with cambric insulating tape rated for 90KV. More about all that in:

http://antiqueradio.org/RCACTC-4ColorTelevision.htm

You are right to think of this as a long term project. Be patient and it will all get done. CTC-4s don't come along very often, so enjoy working with this one while you can.

Have fun!

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

P.S. What's in the little metal project box? Looks like a relay and a tube on top . . . ?