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There's usually 2 vertical stage "K" networks (aka RC couplates) one is used as the vertical integrator for the sync, and one is used as feedback from the very out plate to the first stage of the vertical multi vibrator....If it goes bad it can kill the vertical, cause linearity issues or the vertical can stop and start with weird linearity issues throughout....I had a roundy where a previous tech put in too low of voltage rated micas in their replacement for vertical feedback and it was a PITA to troubleshoot.
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