BOSTON STRANGLER: not the killer or the movie

Does anyone remember an effect called the "BOSTON STRANGLER" . It was sold by E.U. Wurlitzer. It was a box that I think was a volume control with a big black knob on the front. The Idea was that you could turn up the volume all the way and then "strangle" the amp by turning the volume down on the effect. It was for amps with no master volume control. They also were known for killing amps by overloading them too much. I havent seen one since the 80s. It was about half the size of a 6 pack box of instant oatmeal. Has anyone seen one? Especially if you are from massachusetts.