Don,
Australia runs 230VAC 50 Hz but typically measures around 240VAC. The arrangement you described sounds like our wiring. The system we use is called MEN or Multiple Earth Neutral system in that the cold (or neutral) line is grounded at the point of entry to the house (at the fuse/meter box) via a copper stake into the ground. The hot, neutral and ground wires are extended to all outlets. I believe the multiple earth neutral terminology comes from the fact that there are lots of points along the distribution route where the the neutral is grounded, not just at the source.
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I intend to use a three prong plug and ground the chassis. As far as the ON/OFF goes I will probably rewire it so that it is in the primary of the transformer if I install it in the cabinet.
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As an aside, so far, every resistor? I measured (except R20) has been way out of tolerance (high) to the point that I double checked my meter against some known values. Also, R20, the 1000 ohm 1/2W resistor in the B+ line has been replaced at some stage with a 1 Watt resistor and it is showing severe signs of burning, but still measures 1000 ohms.
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Cheers
