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Did you try turning down the brightness at line voltage? What may be happening is when the brightness comes on turned up full it may be pulling the high voltage down which in turn, kills the brightness.
There's a bit of keystone in that raster, possibly a sign of a bad yoke but more likely something wonky in the vertical circuit.
The horizontal squealing is caused by it running way off frequency, you may need to adjust the frequency coil, or possibly you have a cap that's the wrong value in the horiz oscillator circuit (which could also bring down the high voltage and brightness).
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