Confused about converting voltage from USA to UK?

have device usa.
it's piece of audio equipment.
original power supply says

input: 120vac 60hz 15w
output: 20vac 400ma

researched , need 240 - 120v convertor. 1 find.

http://www.maplin.co.uk/45w-uk-to-usa-vo...

plugged in , convertor began smoking , there bubbling sound inside.

please help?

i have device usa. it's piece of audio equipment. original power supply says input: 120vac 60hz 15w output: 20vac 400ma researched , need 240 - 120v convertor. 1 could...

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