G07 popping sound

dyno

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I just got my cocktail cabinet up and running with a 60-1 board in it. I got the cabinet for free and at the time all it had inside it was the monitor and chassis whihc are a G07, it looks like the previous owner recapped the chassis and it has a new flyback on it. When playing games occasionally I get a loud popping sound coming from the monitor which sometimes causes the screen during game play to I guess you can say blip. I am thinking it is a flyback issue but it looks brand new.
 
Most "pops" like you are describing are associated with an arc of sorts.
Maybe try opening up the cabinet and watching the backside of the monitor in the dark.

Double check that the anode lead is firmly attached and clean around the tube's anode hole.
(follow discharging procedures first)
 
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