Sync Problem

[vts1134]

Originally Posted by old_coot88

That's a huge ripple in the B+ supply to the sync and horiz. osc areas, caused by a bad filter cap (or caps).
The sync loss appears to "come and go" due to the slight difference between the 60hz powerline frequency and the vertical sweep rate.

Of course it is! I feel like I should have recognized that .

Originally Posted by earlyfilm

VTS,
You are in no way ready to start a horizontal alignment on this set until you fix this problem.
James.

I figured that was the case. I knew enough to know this wasn't a normal state of affairs, just didn't put the puzzle together.

Originally Posted by earlyfilm

A oscilloscope might be a help in narrowing the problem, especially if it is from a wiring error made while recapping.


James.

I'd like to use my scope on this one to learn more about how it functions. It sounds like the problem could be coming from a bad electrolytic, a wiring error, or an HK short in a tube. I test every tube in every set I work on as one of my first steps so I will say that is the least likely candidate (of course not impossible though). I have replaced every electrolytic in the set so that is the next possibility, but the most likely would be a wiring error. I can look for a wiring error manually, but if I wanted to use a scope to check wiring error or bad electrolytic how would I do that? Bear in mind I have no formal training in how to use a scope at all, but a great desire to learn.