Interesting Asteroids 19V2000 Problem

Hi all. I have an Asteroids that I brought back from the dead that has an interesting video problem. I wonder if any of you have seen it before. After the game warms up the video seems to pulse or momentarily collapse. It then recovers to its former size. Doesn't seem to be related to what the game output is and I tested the game with another monitor and it appears the board is putting out good video. I suspected the HV Diode, but replacing it did not fix the problem. I've already recapped the HV and the deflection boards as well as replacing all the big transistors and two of the deflection transistors on the deflection board. Anyone have an idea what might be doing this? Dying tube? Dying HV transformer? -Malcolm
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Received on Wed May 16 21:40:47 2007