RCA CTC4B "Gainsborough" picked up in San Francisco

[Electronic M]

Glad my CTC-4 thread helped....Makes me think I should get back to that set.

The regulator is a top end limiter, but IIRC it is referenced to boost or a similar fly derived source so it will dip with line voltage somewhat. There is not a lot of problems with the reg being low (for testing), but that has some dependencies.....If the set wants to produce 40kV with the reg cap off and the reg is dropping it to say 10-17kV the reg load on the fly may heat it up and be detrimental over moderate to extended run times... If it's on for under 10 minutes it probably will be okay.

I adjusted my oscillator to perfection with a scope before installing the H output tube, and the adjustments necessary with that tube in, like linearity current dipping, I tried to be totally ready for prior to switch on and perform as soon as it seemed to settle from initial warm up....Perhaps I was over cautious but I never did any harm or had any troubles with the horizontal/HV system in doing it that way.