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if you seem to lack vert height, check for a 1 meg resistor on the vert height control pot. this should go from there to the boost supply.
look for a 1.8 meg resistor on the vert PCB, both this and the 1.0 meg can be checked in circuit (they are isolated by caps or tubes).
I don't recall but see if there is a paper cap .047 off the 10k resistor from the BB term of the fly (should be on the bottom of the chassis). check that resistor and replace that cap if its a paper. If its a disk its prob ok.
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