deano wrote:

There is an earth wire from the mains connected directly to the
metal casing. The 'konvertor' is marked with the double insulated box
icon! does this mean the tingling is not caused by poor component
leakage?

Is any part of the 'konvertor' metallic and in contact with cabinet?

Knowing the cabinet itself is earthed, the leakage you're seeing could
be reaching it from any other appliance(s) in your house.