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Hiwatt 20 amp

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KeepItSimpleStupid

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Ron likely nailed it. Someone was nice enough to make some of the schematics of some of the amps available. See: https://drtube.com/en/library/schematics/66-hiwatt-schemas

www.tubesandmore.com may be a good source of parts especially the can-type muti-capacitor capacitors. Some people for esoteric reasons may stuff the cans with modern caps and/or use the modern caps where they don't show, but leave the bads ones for show only.
 

gophert

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If it happened after an attempted repair, check that the power transformer was not rotated 90° by accident. The poorly oriented magnetic field of the power transformer can bring humm-havoc to the rest of the unit.
 

unclejed613

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also, hum can caused by a heater-cathode short.
 
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