Hi Dom

On Sun, 18 Nov 2007 09:53:28 -0800 (PST), "
wrote:

Earth/neutral swapped on the supply?

Would that cause these results ?

The power supply on the amp (just found the circuit diagram) has live
& neutral coming onto the toriod, with mains earth connecting to the
centre tap on the secondary......

Thinking about it - I'm not sure just 'what' the geny was using for
'earth'.... no ground spikes that I could see.... don;t know what's
the usual arrangement in these circumstances

Adrian