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Charles,
What is the official use of the grey plastic knob behind the deflection yoke. I have the same one on the PVM I posted about, and the manual quickly eludes to "dynamic purity".
BTW: it was a combo of the yoke positioning and the degauss circuit. Once I pulled the degauss coil, and manually degaussed the thing, redoing the beam landing and fixing the degauss cct put it to bed. There was 30v on the degauss coil even after 20 minutes.
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