Early guitar amplifiers were expected to be used that way. There was a polarity switch, and you flipped it to the position where the neutral was "connected" to

Early guitar amplifiers were expected to be used that way. There was a polarity switch, and you flipped it to the position where the neutral was "connected" to the chassis via a capacitor. This arrangement is now known as the "suicide cap." There's a general agreement among players, that having a tech install a proper grounded cord doesn't spoil the "vintage value" of an old amp. Example here: http://www.thevintagesound.com/ffg/schem/deluxe_5e3_schem.gif http://www.thevintagesound.com/ffg/schem/deluxe_5e3_schem.gi...