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If you are now sure the yoke is wired correctly you need to see if there are any strange signals on the B+ boost supply. Boost also feeds horiz. osc as well as the vertical height control and crt. Best tool for that job is a good scope and knowing how to use it. Look at your sams there are 3 caps that filter the boost supply, my guess is that one or all three are open. Your snapshot sure looks like horiz sweep feeding back on itself. Just my 1.5 cents worth. All the best, Tom.J
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