Anyone? Should I get another step down transformer with output of 120 volt?
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It won't matter too much if the amp is 120v and the transformer is 110v.
If it were the other way around then it would matter, as the heaters could go over voltage and the caps also, if they were run close to their voltage max.
As for the rating (watts or amps) of your step down transformer, it should be twice that of what your amp is so it is comfortable.