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the width pot is a supply to the screen of the horz out.
if its getting hot is may be that the screen is pulling too much current.
If that is the case it may be that the plate of the horz out is not pulling current.
remove the horz out tube and see if you have B+ on the plate lead.
Its ok to check the plate lead IF the horz tube is out of the circuit.
This will check the continuity of the fly windings/damper circuit/choke coil, all of which supply the horz out plate lead. Make sure also that the damper filament is lighting, I had a predicta that would loose its HV unless I pressed on the damper tube sideways, turned out to be a bad filament ground stake that only effected the damper tube.
remember do NOT check the horz out plate lead with the tube installed, the strong pulses of a working horz sweep circuit could destroy a meter.
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