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Two things: What are the CRT numbers and what are the RCA part numbers for the parts you have interchanged? I'm assuming the CTC-31 is all-tube, and the CTC-68 is solid state. There may be a slightly different gun structure between the two tubes. More importantly, though, I'd check to see if any surrounding metal is still magnetized, I've had trouble with residual magnetism in steel-cabinet setups.
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