Last night, I changed out all the resistors surrounding the vertical osc and sync amp. The old ones I pulled out all checked within spec, but, apparently one or more of them was drifting in value as the set ran. Now, the drifting vertical roll has been corrected and getting a lock is easy! Yay!
Watched it last night for about 3 hours without ever needing to touch the vertical control.
Interlace is a little bit out of whack, but not so much that the lines have completely merged. I was going to build a new vertical integrator, but am short a couple of capacitors. I'll build one later when I get home. I should have everything I need there.
In my last post, I mentioned having unstable B+ voltages. When I changed the 5U4, the B+ became stable at 262 volts. Apparently, the failing resistors in the vertical/sync sections were a strain on the B+ because now the B+ is stable at 278 volts (specs called for 275). Cool! Killed two birds with one stone!
There is one last issue that I've discovered... high voltage at the crt calls for 16KV. I am getting nearly 21KV. How can I tune this down??? There is no HV adjustment.
The picture this set makes is quite impressive. I've been using the DVD player on it. Late last night, I tried tuning in stations only using the set's internal antenna. Picking up stations up here in the woods is usually difficult, but I was able to get a few. Surprisingly, the station that tuned in the best was channel 11 out of Houston.