When I get my hands on a FBT, I will bring it to someone who was in the CRT business. I'm pretty sure it's the problem, but shall share more details when I know you are still around .
For me, unfortunately, Sony stopped producing the FBT. Just when I have the infamous defocussing error caused by a faulty FBT. If you ever decide to dump the monitor, I might be interested in buying the FBT..
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