TIA.
It'll still be a big CRT monitor, and generate heat/suck power,
but the pincushion circuit is just a low-volt amplifier in these
machines; probably the coupling capacitor near "pin amp"
markings on the main circuit board is in need of replacement.
Capacitor failures (mostly dried out 'lytics) tend to be more gradual
than a sudden change. It's certainly worth checking the caps but keep
an open mind about other possibilites.
G²
I've already replaced the monitor with an LCD. The failure took
about 10 minutes, from twitching to waviness to finally a total
hourglass shape.
Thanks for responding.