I should add what the item is guess I was lost in my nut .. ok the item is a preamp it's a Consonance OPERA t99
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The IEC connector on the unit can be used for 120V as well as 220V. I would contact the seller that sold you the piece of equipment to verify exactly the voltage. My guess, if it says 220V on the back it is 220V. Contact the seller.
As for using a transformer you will need to step up the voltage, 120V to 220V. For safety you should not use a standard 120V receptacle for 220V. That means you will not be able to use a cord with a 120V plug.
Can you return the piece of equipment? Did the seller represent the equipment input power 220V?