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Usually if the boost increases when the yoke is disconnected, it is a bad yoke. First remove the damper and note if there is any picture at all. If a distorted picture shows briefly, (it is a series set) then look for a shorted cap from boost to B+. If not, i suspect the yoke. If it is OEM code 274, it's definitely bad. Other brands need verifying before replacing.
Good luck.
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