Hmmmm.Could it be the step transformer is feeding the amp a very clean, very constant 110? In other words, it is, by default, acting as a (seemingly successful) power line conditioner?
A question for technically astute
I have recently repurchased a Sophia Baby amp on A'gon at a really cheap. I suspect the cheap price the result of it being a 220 model. I think somebody move back from Europe with it. They bought a step transformer so it would work on 110. Anyway when I listened to it , I could swear that it had much better dynamics and slam than the first one I had. It seems like it can get much louder before compressing. The speakers might be a little more sensitive than before but not much. Is this my imagination or could this power arrangement make a difference?