"Models TRK-9, TRK-12, TRK-90, and TRK-120: AC, Superheterodyne, High-Picture-Definition, Five-Television-Channel, Receiver and Three-Band, Electric Tuning, AC, Superheterodyne Broadcast Receiver". RCA Victor Service Data Volume II: 1938-1942: Radio Receivers, Phonographs, and Television(PDF) (1st ed.). Radio Corporation of America, RCA Victor Division. 1944. pp. 261-C, 275-C.