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Dunno if I can help, but I had an KCS-8? RCA with a jitter that drove me crazy. Problem was some increased value resistors between the vertical sync amp and the oscillator.
If your Stromberg is based on the Dumont RA-103, the schematic will look like the one I've attached. Check the three 10K resistors and the two caps hanging off them. They, as a circuit "clean up" the vertical sync for the oscillator. If your height and linearity are A-OK, I'd guess the problem to be among those resistors. RCA used 22K ohm resistors - I still have one of the bad ones hanging from a bench lamp mount above the workbench. It reads 34K, a wee bit out of tolerance.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
Last edited by Findm-Keepm; 09-29-2017 at 06:39 PM.
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