120v to 240v Adapter to power Amp in USA

I had already paid and everything and they made the dealer from France refund my money. All amps are made to order and they wouldn’t do it even though I said I would pay extra for the 120v option. Still waiting for the refund to go through. 

The distributor in the US is super nice and knowledgeable but I don’t think overcharging because you have a monopoly is very cool. These things go for €839 all day long all over Europe. 

I do believe that you can get an outlet in your home for 240 volt.  My dryer and other large appliances were plugged into them.  I don't know if that is the same outlet needed for your amp.

What you need is a voltage step up/down transformer/converter
https://www.amazon.com/dp/B06VVXN2SR/ref=psdc_10967761_t1_B00FHIF8KC

A cheap adapter is never going to provide enough current for an amplifier. The way is to use the natural 240 in your home or apartment. Plenty of 240 appliances. Particularly air conditioners. In my apartment are two 240 appliances. The stove and the air conditioner. I even have a pair of 20 amp breakers which could easily be converted to 240V no problem, hardly any hassle.I suggest you get an electrician to install a 240 receptacle, plus new breaker into a spot where you now have 120v (you could even do both if there is a two duplex receptacle pair. one 240, one 120.The plugs are very different, so no chance of plugging a 120v into the 240v.)

That's another option, sure, but if $165 for a transformer is too much then paying electrician may be no less or more. Besides, what if he doesn't like the amp and sell it in a month ? Transformer might somewhat degrade the sound... 
What about the frequency of those 240 V circuits ? Does it matter for that particular amp ?