The more I fix it, the broker it gets. When I fried the horizontal size pot I noticed that I'd lost some horizontal dimension--couldn't get it to fill the screen. I thought the horizontal size would go back to normal when I replaced the pot. But after the replacement the size continued to diminish. The next time I powered up the set, the horizontal size was even narrower. I started rechecking voltages and found that the low voltage rectifier filament was getting no voltage (previously it was 275 VDC as specified).
So I guess I have a problem with the transformer. I hadn't noticed before, but the transformer is missing four out of six bolts, so maybe someone has taken it apart before.
So, I'm requesting advice on these questions: Why did the transformer fail? Is it worthwhile to disassemble the transformer? Is there anything fixable inside? Is there a work-around for a single dead secondary coil (keeping the other two functional)? Finally, should I just go back to working on radios? I have a nice Atwater Kent that I haven't broken yet.
For background, this is a link to the full schematic which shows the wiring as I found it in red and my rewiring to conform with the original schematic in blue.
https://picasaweb.google.com/lh/phot...eat=directlink
Always appreciative of your guidance,
Winky