WG K7901 issue

Humdinger

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Just put a perfectly-rebuilt, late-model, tan-colored 7901 chassis with the 10-pin neck socket on a 19" 1998 Orion tube in a Ms. Pac with a 60-in-1 in it using an Arcadeshop Ms. Pac cabinet-to-Jamma adaptor and switcher. Screen comes up with a beautiful but kinda shakey picture of the horrid menu in the background, but the foreground looks like a severe sync issue with vertical, full screen-length, thin black and white lines moving left to right. Assuming the 7901 is in the "K7000" group that works with a tube in the 2.9/13.5 impedance range, which this tube is, any idea on what could be the issue here?

And yes, I have the dips on the Chinese crap board set properly, and I have the 3-position sync plug on the last pin on the chassis's video input only.
Thanks for any advice!
 
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