Quote:
Originally Posted by zeno
Old trick for arcing was turn off the AC & open the shop doors on a
humid day. Sometimes just blowing on it will trigger it.
Trouble is everything in the focus is known to go bad.
Arcing was usually the socket or filament winding. Keeping one of the
stick rectifiers around is handy for test or eliminating the tube & socket.
73 Zeno 
LFOD ! |
It's humid here by the coast. Could've been some condensation, or maybe an increased load due to having the supply voltage to the color amps out of circuit that could've compromised the focus components - hard to say. Checked (dialed down) the screen drives against service mode, but that didn't affect focus.
I did measure 4KV at the focus CRT pin - so that may be a little low...
https://ibb.co/jy0BFp8
Not psyched to pull the chassis for the 168th time, but I need to check the windings and other stuff for drift and leakage
Pic
https://ibb.co/0qBwfJr