Re: Eddystone S640. Mains primary open circuit.
Another way out- though still a bit of a kludge- would be using a transformer with 40V or 20-0-20V or 2x 20V secondary as a bucking device to produce a 200V supply from incoming 240V mains. I don't think that this set would consume more than 80W, possibly even 60W, so a 20VA bucking transformer should suffice.
A second-hand transformer will likely be the cheap'n'easy part, I find the safe and sturdy enclosure for things is often the time'n'money bit!
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