I have an Ernie Ball phase shifter that I bought brand new in about 1976. It is wedge shaped with the large knobs on either side - one which is labeled "Balls". There was some sort of controversy over the name of this control, and they changed the label on them until they stopped making them. Mine still works perfect. I want to sell it, and I went on E-Bay to price it, but could not find any Ernie Ball phase shifters in there. Does anyone have a clue as to the value of this thing? And is E-Bay really the best way to sell it?