On Thu, 29 Sep 2011 10:03:30 +0100, "N_Cook" wrote:

less than 0.1 ohm between input ground and mains ground in all 3 cases of
the VC30 , his other amp and my amp to confirm a VC30 problem


Is one side of line bonded to ground where you are? If so there may be an
incorrect bonding or lack thereof.

??-)