Gig-fx PRO-CHOP, Operating Manual

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ground connection. Consult an electrician first if you need to
modify any 220V mains connections. 220V is a deadly voltage.
In conclusion, providing that one of the amplifier grounds is still
present throughout the circuit, it should be safe to lift one of the
grounds and any ground-loop buzz should buzz off.
Powering it up - AC Adapter
The preferred adapter is a regulated 9V DC supply class 2 adapter
with minimum 50mA output current capability. Most
commercially available 9V adapters designed for pedal effects will
work (2.1mm diameter plug)). No harm will come to the unit if
the power supply jack has the wrong polarity, but double check
that the center-pin of the power jack is negative polarity.