DuMont RA-102 vertical transformer bad?

[Phil Nelson]

I ended up getting a Stancor A-8124 transformer from Moyer Electronics.



Replacing the bad old transformer fixed the vertical problem with the peculiar slanting lines and inability to lock. However, there is a faint vertical jitter that won't go away with any adjustment.

In the "Rider Receiver Trouble Cures" book at the ETF website, I see the following modification for curing vertical jitter in the RA-102:





(The tube shown in that diagram is V16, the same tube shown in the schematic posted earlier.)

A couple of quick questions before I start reworking things on the transformer that I just installed:

1. Has any other RA-102 owner done this, and would you recommend it?

2. What's going on with this mod?

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html