21ax gassy or bad 3a3?

[old_tv_nut]

Squeals could be arcing, but also could be the H oscillator not running properly. An oscilloscope is really useful for checking this out.

[SwizzyMan]

Turns out the the new 6CG7 horiz osc had a short in it and so did the new damper. Replaced those with the originals and got my HV back. Is it normal for the HV to only measure 4-6 kilovolts without the crt or yoke plugged in? I am running the chassis on the bench.

[old_tv_nut]

Originally Posted by SwizzyMan

Is it normal for the HV to only measure 4-6 kilovolts without the crt or yoke plugged in? I am running the chassis on the bench.

I have no idea, but I'm not surprised. Running without the yoke doesn't seem wise, as the system is tuned to resonate one half cycle during retrace with the yoke connected, and it's hard to tell if disconnecting will put less or more stress on the horizontal output and damper. I think it would be worth the effort to make extender cables.

[Electronic M]

Originally Posted by old_tv_nut

I have no idea, but I'm not surprised. Running without the yoke doesn't seem wise, as the system is tuned to resonate one half cycle during retrace with the yoke connected, and it's hard to tell if disconnecting will put less or more stress on the horizontal output and damper. I think it would be worth the effort to make extender cables.

I agree. As someone who has run a CTC-15 without the yoke I can say that it will loose more than half it's HV without the yoke connected (and that should approximately go for the CTC-5 too). Like o_t_n, and I said earlier the yoke is part of a tuned circuit (the horizontal stage), so do not expect it to work correctly without the yoke.