[JSMCMS]

Hi Eric,

Not insulted at all. Just trying to figure things out. Thanks for the suggestions.

It’s overshooting about 15%. There is a horizontal width adjustment but it’s all the way at one end. It’s an adjustable coil in parallel with a portion of the flyback. From what I can tell, it’s pretty standard stuff for the era. It’s tied into the 615v boost but it’s running low (~575V). My thinking is the coil de-tunes that portion of the flyback reducing the deflection thus controlling the width. I am not sure. What I do know is both the high voltage and the boost voltages are low and it seems that the 17DQ6A controls that part so getting the right values should be achievable. Maybe not. Like I said, I’m still learning.

Does any of that make sense? Am I delusional?

Oh, almost forgot. Yes, I’ve tried using my variac to simulate voltages. I am reluctant to increase much above 130VAC because the high voltage really does change all that much when I increase it. However, when I lower it to 110VAC, dropping B+ to about 230VDC, the width reduces to the point where I can properly adjust it. The filament string drops to around 80VAC and all tubes run about 25% low. I’m guessing that might improve tube life but then again, I’m not so sure.

Thanks again for your thoughts. I really appreciate it.