Change the Power Voltage


I was following a discussion of an ad concerning a Gryphon amplifier that caused quite a stir among many,a few days ago. Part of the discussion touched on the power voltage of the amp at around 230-240v. It cited ,though ambiguously, that it can be change to 110-120v, so it can be used here in the US. 
I would like to know where can this be done. Change the power voltage. An electronics shop or dealer? Can anyone point me to the right direction? Is it possible to have a universal power selector installed instead? Is power voltage the only thing that needs to be changed and everything works well after it's done? How much does it cost? Estimates are welcome.
I am the second owner of a well cared Gryphon Callisto 2200 integrated amplifier. I tested the unit at our garage that carried a 240v line, it works.
I would like to thank everyone for any help that they can share.  Again, thank you.
mushashi78
Check the back of the amplifier.

There should be a dial or click-knob for adjusting to the correct voltage.
Perhaps I don’t understand your question completely, so I’ll mention something else.

You would need to buy the same power transformer (in the voltage you require) and have a repair person swap it for you. If this can’t be done, you can buy a voltage convertor. 

FYI, some amps can run at 110v or 120v - so try the lower voltage first. A good amp will automatically power off if the voltage is wrong. (fuse) and protect internals.
I am interested as well by this thread.
There is a Audionet Humboldt for sale on Audiogon at a very good
price. But it is 220-240 v  .  Audionet factory in Germany refuses to change the power transformer for north america standard  , even if pay  for it. I wonder if a voltage convertor would affect the sound quality of such a high end integrated amp.  I planned to connect it in my power conditioner  . Will that works with a voltage convertor  and keeps his audio qualities ? I am nether an electrician
 nor am I very technical .
I have been looking at portable power generator.
https://www.goalzero.com/shop/portable-power/

And other brands
The are 110-120 v. output

A 220-240 v  output could do the job.

It all depends on whether the unit has been designed in the first place to be adaptable to different countries.  There are threads here on the 'gon on going into Accuphase amps and changing over some wire connections, to achieve 110/120.  You definitely need to know what you are doing to accomplish this safely.  But other brands/models may likely not have this feature, and therefore be manufactured specifically for one country or another.  In which case a transformer is required.
Gryphon does NOT design their equipment to be be able to change voltages.  Any change of this type is being done by someone altering what Gryphon installed and immediate voids any warranty.  This is specifically stated in their manuals. 
Why don't you run it off 220/240 vac? I have found that amplifiers sound better if you run them on the higher voltage. Of course that will mean installing a special outlet, but not that difficult really.
@OP
If  you live in your own house, ask an electrician to bring 240v from the electrical pannel to your listening place. It is not very expensive.I rent an appartment so it is not possible for me.
I have to agree with some of the other postings, it would be less expensive to just run a 240 volt line and plug. Plus the performance would probably be better and less electricity would be used.
This is the type of question that should not be asked in a forum.
Everybody has an opinion and most are simply wrong or misleading.

And no,  when going to 220v versus 115v you will not use less electricity geez.

Yes simply run a 220v line and move on.


Look on the back at the fuse holder. If you see two different fuse values for 120V and 240V then it is very likely the voltage can be changed to 120V. You can then try calling Pyramid Audio, United Radio, or George Meyer AV and see if they can help you out.
invalid
... it would be less expensive to just run a 240 volt line and plug. Plus the performance would probably be better and less electricity would be used.
No, the same amount of electricity will be used at either voltage.
No, the same amount of electricity will be used at either voltage.

If the same guage wire is used there would technically be less loss in the wire with 240 volts.
I would like to thank everyone who shared their opinion and knowledge about the matter. It has given me the opportunity to move to a certain direction.
Again, my gratitude to everyone.