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The picture you posted looks like the Horiz Oscillator is running way off frequency but maybe it's just lines of interference?
Does the Horiz Hold control on the front have any affect?
It's been so long since I worked on a 621/721 I can't remember if they have an adjustable frequency coil or not, I would think they would have to.
Looking at the Riders on the ETF I can see a Horiz Osc Transformer but it doesn't appear to be adjustable.
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