CTC-4 Director 21

[Electronic M]

Personally I'd pull the H output tube, till the recap is done and the osc. has been dialed in with a scope. Don't want to risk your flyback. On my 4 I did it that way, and when I was ready to install the tube I had it set up to dip the cathode current using the linearity/efficiency slug as soon as I had HV....I pretty much confirmed I had decent sweep and HV then immediately dipped the current. If something is wrong and the fly is being fed too much current, you don't want to run it that way long....We refer to flys for early sets like this as unobtainium for a reason!