Hello everyone
I introduce myself
my name is Angelo Santoro are from Rome Italy
lifelong fan of the Fender
I own a supersonic 100 head that I find fantastic for my sound
but it has a problem that I can't solve
inserting a jack into the send/return to get a boost of 12 db
or by inserting a delay or other type of pedal
there is a loud mass hum
disappearing as soon as I take off the links
and the amp comes back silent and sounds perfectly
a technician checked it but couldn't fix it
if any of you have heard of a similar problem
could help me solve this thing
Thank you
excuse me for my English