I would not recommend plugging the 100V amp into 120V. If any of the caps operate near their voltage rating, the extra voltage may be too much for them.
If you could use a variac and check them, you may get away with it, but the amp will now be capable of producing more power which could strain the transformer.
As far as the transformer swap, the lead 12 runs on +/-19V, where the MG10 runs on +/-15V, so the transformers are not the same.
If you could use a variac and check them, you may get away with it, but the amp will now be capable of producing more power which could strain the transformer.
As far as the transformer swap, the lead 12 runs on +/-19V, where the MG10 runs on +/-15V, so the transformers are not the same.