Hi guys, aside from the 60 Hz interference I've been seeing, I've noticed the whole screen "flashes" or flickers (like a half-second loss of vertical hold) briefly when pressing fire on either joystick.
I've tried swapping out the 4050 chip in this heavy sixer, and have also done the field service manual static fix on the joystick port caps, adding a diode across a new cap. No change.
Any ideas? Thanks!