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Searching for silent 220-110 step down transformers


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The 220v - 110v step down transformers your tax dollars bought me have an audible 50Hz hum coming from the transformer and it’s driving me crazy. 
I’d like to source an alternative low-wattage (under 200) unit that will be dead silent for my listening room, but I’d like to know for sure it’s silent before I ship it all the way to Moldova and plug it in. 
Any d-_-b recommendations?

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Helpful information, gentlemen, thanks. 

I’ve not found any lono transformers with the right windings yet, but I did find a 500W Plitron step down converter that handles 220v-110v here: https://m.aliexpress.com/item/32979526968.html?spm=a2g0n.productlist.0.0.58bb3e80yKcyh9

I’m always leery of Aliexpress, but does that look genuine to you?

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