Found a Videodyne on CL

[Eric H]

I've been working on this slowly but steadily, it's completely recapped but there are a few caps I just tacked in for diagnostic purposes and still need to restuff in the original paper sleeves.

The set was having some vertical issues, sometimes working, sometimes jittering all over the place and folding over, also the vertical output tube was overheating and a 22k resistor to the Sync tube (one I had already replaced) was getting hot enough to discolor.

I replaced the Vert Hold pot that was very flaky, that helped some but it was still having issues, they got worse after it ran a while.

Did some voltage checks and found some serious discrepancies in the Vertical section, that turned out to be an open winding in the Vert Blocking Transformer, tacked in a new (but incorrect) one and it started working very well. NOS Stancor transformer is on order, also some NOS Allen Bradley 1 meg resistors to replace a couple that are more than 50% high.

Here's a short video showing it malfunctioning.

And a picture showing it after subbing the bad transformer.The transformer I used is the wrong part number but is probably close enough I could have gotten away with leaving it, however the correct part (Stancor A-8111) was easy to find and cheap so might as well do it right.




The temporary transformer install, all the old paper caps here except the dangling one have been restuffed, the yellow caps and the blue electrolytics will be restuffed inside the original sleeves before it's done.
I had to dig up four 1949 era Sprague .1@600 caps to replace some that had been replaced way back in the sets history, I could have restuffed those I guess but I decided to use the type it left the factory with.
All the OEM caps in this were Sprague, none were Bumblebees or Black Beauties, that's good because they would have been hard/impossible to restuff.