Advanced SSB Transceiver Digital 500D
"Frontier Electric co Ltd." Model Advanced SSB Tranceiver Digital 500D ham radio short wave transceiver, made in Japan 1973. Transistorized and tube lineup 6KD6 (PA), 6AW8 (driver), 6BZ6 (RF), 6BQ5 (AF). Digital display by Nixie-tubes. Supplementary photos