Museum of the Game® & International Arcade Museum® Forums

I have a joust I am working on that had a WG4900 in it but the tube is really tired with a lot of tetris burn so I stuck this Sampo monitor I had in it for now until I can find a good compatible tube to swap for the 4900.

The Sampo monitor actually looks great but after its on for a few minutes I get a high pitch whine out of it, if you turn it off and back on it goes away and then comes back after a few minutes.

I have not done a cap kit on it yet but wanted to check if anyone had any thoughts?