Cool Sovtek. Sounds gnarly. Wish I got to play it cranked.
Transformers are shielded to limit hum, but also there are gaps in the shielding so I don’t know how well this will work. If you look at the Ampeg B-15 the shields around the transformers are one solid piece with no gaps. I believe this is the ideal
Nothing special about this repair. Just needed new power tubes. Mostly just posting to propagate schematics.
Sovtek MIG 60 schematic