Hi Mark,
The power adapter takes 120 - 240 volts at 0.6 amps 50 or 60 Hz as an input, and delivers 15 volts at 1.4 amps as an output. If you want to buy a power adapter without plug adapter, you may be out of luck. There are third party power adapters for the Echo that I've found, but they all have US plugs. I couldn't find anything about the Echo's actual plug specification, so your best bet would be to buy an adapter that provides the right voltage and amperage and solder in the plug from the original adapter.
Regards,
Alex