Re: CRT is brighter to one side
It doesn't look like a convergence issue, in fact it looks like a PIL tube which has no such adjustments, or very few.
Many sets used a 200V supply for the RGB output stages which was rectified from a winding on the lopt usually, or sometimes a winding on the smps transformer, synchronised with the lop stage. In such sets the reservoir capacitor for this supply can dry out causing the 200v to "droop" between flyback pulses... with symptoms exactly as is seen here. So possibly a capacitor fault.
Pete
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