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Interesting. So first of all I was running the set off my light-bulb current limiter so the bulbs were limiting the degaussing pulse!
Today I ran it off mains but still no "boing" noise. I tried measuring the voltage with my meter set to read the max value and I read 68V - the coil reads 18 Ohm.
Checking at the back, it seems that I should expect full mains at the coil, would you agree?
Anyways, I managed to fix the board. I fixed the 70V line and picture came up much better on screen. I did a full white balance and cutoff adjustment and now it's ok - besides those blotches on screen.
I'm aware the de-gaussing is unlikely to fix them but I feel the circuit is not working anyways so I'll look into that regardless.
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