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Success! Swapped the horizontal oscillator for the one in the vertical sync circuit, and my horizontal problems went away. (Well, the width coil still doesn't do much, but the major ones are gone)... and now my vertical is sensitive to vibrations. This is one of the original three, I'm guessing it must have been the one not being used as an oscillator. Certainly a red herring chase... it was so damned sensitive it would change frequency/drift if I blew on it... or tapped literally anything. Yeesh.
Apparently that one 6SN7 is just very microphonic. Why are replacements so damned expensive? (*glares at audio crowd*)
Still no idea what's making it the horizontal chitter on startup though (like the first video I posted). I guess if it's not likely to hurt anything it's not a big deal, just curious.
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