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https://www.maplin.co.uk/p/240v-to-110v-300w-voltage-converter-vr05f
Be aware that the power rating you need is *not* 20W - that's the rated (clean) audio output power of the amp. The power draw will be much higher. I had a look at the schematic and the fuse value is given as 2A on a 120V supply, so the amp must draw less than 240W - so at worst, you need a 300W transformer.
In fact, it's likely to be less than that - my guess from the output power, number of valves etc would actually be somewhere between 100W and 200W, so a 200W transformer would almost certainly be safe, if you can find one cheaper than that - but there's no disadvantage to going bigger than you need, other than size and cost.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Noiseless" ? Why? If noise could be a problem, silent recording perhaps, you could be bothered..
Such transformers are not designed for High Fidelity equipment and so can buzz a bit! If that is a problem you will need to get it a good distance from the amp. No bad thing in a "Studio" anyway since the things chuck out an horrendous hum field!
Dave.
Cheers
Al
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
https://www.maplin.co.uk/p/maplin-230v-to-110v-100w-voltage-converter-rs59p
Don't be tempted to buy the other sort of 'voltage converter' by the way - these are small and light, but only suitable for a limited number of applications, mostly resistive heating devices like hairdryers, and not for an amp. That's why (in my opinion) the proper units should always be referred to as a *transformer*, not a 'converter'. I know Maplin and many others do mix them up.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein