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No appreciable progress on the funny behaviour, I think it is simply how the 6SN7 warms up. It's definitely not caused by the sync pulses and is siightly different if I swap around the 6sn7s in the set.
I also disassembled the yoke to investigate the ticking I was hearing... quite possible it was arcing to the dag as the varnish on the windings is cracked and crumbly. Gave it a coat of corona dope and letting it dry now.
Also changed the 560 ohm resistors in the vertical section, they were way off at over 700 ohms each.
There's a 1.2k in the horizontal section that someone seems to have swapped for what's supposed to be a 1K. Dunno if that affects the width much, so I'm debating whether to change it back or not.
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