I've had no hum or any other anomalies. Still always kinda bothered me in the back of my mind for some reason. Tried to get them switched but nobody wanted to mess with it in my area.
I think you can get away with out the frequency converter if its just an amp and preamp with no digital or clocks. then just the step down-up. I ran a Luxman L560 Japan only Integrated on a step down TX for a couple years worked great, so did the amp. The amp even said 50-60hz 100vac.
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