My CTC-16XL Project.

[old_tv_nut]

Yamamaya42, what kind of meter are you using to measure the DC on the cathode? Could it be the pulse waveform is fooling it?

Another way to measure DC on a pulse waveform, with a scope:
1) set the scope for AC and center the waveform vertically within the screen.
2) note the level of any convenient point of the waveform
3) change the scope setting to DC
4) note the CHANGE in voltage of your picked waveform point (the DIFFERENCE between the reading in AC mode and DC mode) - this is the actual DC (average of the waveform)

[Yamamaya42]

Originally Posted by old_tv_nut

Yamamaya42, what kind of meter are you using to measure the DC on the cathode? Could it be the pulse waveform is fooling it?

Another way to measure DC on a pulse waveform, with a scope:
1) set the scope for AC and center the waveform vertically within the screen.
2) note the level of any convenient point of the waveform
3) change the scope setting to DC
4) note the CHANGE in voltage of your picked waveform point (the DIFFERENCE between the reading in AC mode and DC mode) - this is the actual DC (average of the waveform)

I thought of that, and I looked for a waveform on the cathode and there was none, even with the o-scope turned down to 500mv, but for some reason I'm seeing a wave of over 150 in G1, which I don't think is right at all.

I plan on re-testing with a analog volt meter later, but something tells me that horz wave is too high , for some reason SHOULD BE 50v max, and they made a mistake someplace when they were putting new stuff in before i had it.