On Sun, 28 Feb 2016 19:23:20 +0100, Dimitrij Klingbeil wrote:

P.S. That voltage estimate has probably surprised you. Unless one looks
at the circuit schematic and adds all the voltages from all the storage
elements (inductors / capacitors), considering timing and phase, it may
not be obvious that the thing was intended to run at such high voltage
levels. But there's a reason why they used a 1500 V transistor in it.

And yet C1804 is rated at 'only' 630V. Weird!