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I have an 8-inch Sony from the same era that's got the same problem, only quite a bit worse (it's off the bottom of the screen with scan lines about 1/2 inch apart). It's on frequency, and you can sort-of see the vertical roll and lock when you turn the vhold control.
I picked it up at a junk store for cheap, and figured a recap would take care of it. Imagine my surprise to discover that it had already been completely recapped in the power supply and vertical section. Voltages and waveforms are all as they should be, transistors and diodes check good, transformers ohm out correctly, but...the vertical is still messed up.
I guess someone took it to the junk store when they couldn't fix it.
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