[Elecraft] [K3]Advice needed from audio grounding experts

[Dave, G4AON]

Paul, I think you are looking at the wrong side of the transformer, on 
the circuit diagram the right hand side connects to the rear panel 
sockets via J91 and is "floating" with respect to DC ground.

73 Dave, G4AON
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 >According to the schematics one end of the K3 line out isolation 
transformer
 >is DC grounded and the line in transformer is DC floating (just to be 
clear
 >I am talking about the windings for external connection).