[R-390] R-390A and GFI

[Jacques Fortin]

Jim, this is most probably due to current leakage of the line filtering
capacitors inside the R-390A AC filter.
Long-term solution is to change the line filter to a modern one or re-built
the old one.
Not connecting the safety GND wire is an UNSAFE solution.
The only other "simple" way I can think about is to use an isolation
transformer (117V to 117V) to prevent current(s) passing in the GND
connection of the GFI.

73, Jacques, VE2JFE in Montreal