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Update
Thanks very much for the feedback. Since my first post, I did find the damper resistor (R113) was open. I thought for sure it was the smoking gun but replacing it with a new 6 Kohm wire wound resistor only improved the linearity slightly. I’ve replaced and double checked the .035 uF & .05 uF caps. What I did find that helped significantly is adding a 250 ohm resistor across the linearity control coil. I tried different values but 250 seemed to work the best. The two attached pics show the difference. Without the resistor, center is compressed. With the resistor, right side is compressed. I also swapped the damper tube with a solid state replacement but that provided no change. Adjusting L28 or L29 has no visual effect. At this point, I’m going to go through all the waveforms again and compare with the RCA630TS service manual. I’ll also re-check the tube voltages. If I still don’t find anything I’m thinking of buttoning it up and calling it “good enough”. If anyone has any other ideas, I’m all ears. Thanks again.
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