Dr. Z Carmen Ghia 2x10 combo

Fender Bassman

Soldano Hot Rod 50


Fender Princeton

Fender Pro Junior

Hartke 3500 combo and Subway Rocket Reverb:


...or as I like to call it: the "Shock Me" amp.  No ground!  There was also no way to add a ground to this circuit.  Bzzzt.  Bzzzt.  Owww.