I posted this on KLOV too, have not had anyone with same experience, so will try on this side of the fence.
I have just acquired an original Space Invaders upright arcade game. All works great. But I noticed that when someone else is playing one of my EM pinballs, faint vertical lines appear on the SI monitor for a split second when a solenoid fires.
All the machines are in my basement on the same circuit. I tried one of these:
amazon.com link »
and it made no difference.
Even with just the SI and one PB switched on, the furthest one away (3 yards), it still has this affect.
I am wondering if this is damaging the monitor, because if not, I can live with it as its rare someone plays a PB when the SI is on.
But if it is, any thoughts on resolving?
Thanks.