In a message dated 02/20/2003 8:47:57 AM Central Standard Time, b_paul_ncp@xxxx writes: << Unfortunately, the amazing devices that made up the system weren't reliable. Vacuum tubes may have worked well in car radios, but they could not survive the harsher environment of the engine compartment. >> Electrojectors were transistorized, with the "Black Box" mounted out in front of the radiator. Joe Savard