I'm not sure what type of PSU I have - It may be the one shipped with the MK1 possibly.

As for resting on conductive materials - here's a picture of my working environment (attached) - I tend to rest the empeg on the bottle of screen-clene, which isn't conductive. Could the power supply be knackered?

Cheers,

Paul.

Paul Haigh, Reg. 4120
(mk1) 6GB, Blue, 00254
(mk2) 12GB, Red, 00357