It could likely be the vertical output transformer. My set went through two of them. The convergence winding goes bad and it can take out the two resistors that provide B+ to the vertical stages. It is not a difficult part to replace but may be a little hard to find. If you already have a new yoke, I hope that fixes it. These sets really perform well when correctly set up.
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Just look at those channels whiz on by. - Fred Sanford
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