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Hi Tom,
The minor fluctuation in vertical size is entirely tolerable, what I am more interested in is why the vertical size must be turned all the way down to get the right size of picture with decent linearity. If the size could be cranked down, say an additional 1/8 turn, a better compromise could be has between size and linearity. I believe the vertical oscillator and output get their B+ from the power supply and not from boost, but I will have to double check.
-Max
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