Got a Dumont RA-103 Dog(mouse)House and a GE monitor.

[Electronic M]

Brought them in the garage and tested the CRTs. The one in the GE tests excellent.

The CRT in the Dumont had an unplugged brightener on it. It started off bad, but with brightener level heater voltage got almost as good as the CRT in the GE...Dropping back to 6.3V after that got me the bottom edge of the good range.


Better pictures:

Originally Posted by ChrisW6ATV

Tom Albrecht repaired one of those tuning shafts on his Crosley 9-407 (with the same Dumont chassis) a while back; you should be able to find his discussion of it. He had an excellent description of the problem and his work.

Good to know. VK's search function did not find it. Got a link?