This is the wrong way about it. I bought a TI desktop 1 from USA when they first came out. For a few years I just used my European power supply for a virus b (which is a 240 wall wart just different wall fitting).
Then one day I just tried a matching amps Australian wall wart, it is 1Amp 12volt for Australia, works fine for years now. The usa one is going to be 110volts and will not convert with a simple adaptor like the Euro one I used, google '240 to 110 step down adaptor' and you'll see there a bit cumbersome, not convenient. Plus if you find a regulated power supply it will match 100%, some unregulated wall warts say 12v but give 14v or 11v etc depending on the amount of load.
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