Hi everyone,
I happen to be here in Europe, with 240v power. I'm using a 100watt transformer into a hotrodded electrical box. The bottlehead on 50 Hz is mechanically pretty quiet. I found that the secret to very good and quiet sound is to use the properly rated transformer. I've got one tricked out pioneer dv-09 straight into the S.E.X. amp, both running on the 100watt transformer, and the noise floor is mechanically, and electrically super low. This setup just smoked a Music Hall 25.2 DAC. The source pulls 57 watts stock, and the bottlehead never runs out of room. in europe, i'd say keep the step downs as small as possible.
gpbarnett