step up transformer noise


I purchased an amp from Europe that needs 240v [ I am on north American voltage].. I bought a step up/step down transformer to equalize the voltage. it works, but the transformer produces noise through the speakers, even when the amp is turned off. the transformer I bought was $60.. do I need one specific for audio applications? any suggestions?thanks for any help, dan
pianopig
Or a cheaper alternative would be to do as I have done - run a 240 wire to a new outlet. You'll have a dedicated power source and better performance.
You don't even need a new outlet. Google "240 volt split duplex receptacle (adaptor). Easy.
Is it better to position a step up transformer near the phonostage or near the turntable to prevent issues with hum?
Is it better to position a step up transformer near the phonostage or near the turntable to prevent issues with hum?
Are you talking about moving coil cartridge SUT?

https://forum.audiogon.com/discussions/where-to-insert-the-step-up-transformer?sort_order=asc
Is it better to position a step up transformer near the phonostage or near the turntable to prevent issues with hum?

Best to keep anything with a strong magnetic field as far away from your TT and phono stage as possible.