U.S. Marine Corps C-7673/PCC-1 Control Unit, Rectifier 6 x 9 x 2-inch box that interconnects two PRC-25/77's for retransmit, and feeds power from various sources including 117 VAC. Mine worked for a while, but is now, as the wingnuts say, TANGO UNIFORM. Any help appreciated, Al -- Al Klase - N3FRQ Jersey City, NJ http://www.skywaves.ar88.net/