Mono tube amplifier. loudness contour switch adjustable -30 db -0b bass, treble. Inputs: Tape, aux, radio LP: AES, NAB, RIAA. All controls clean and good! No leakage around filters caps, (recommended replacement re-cap). Output tubes: Good, getting slightly hazed, but still has life! GE back plate 6L6 Slightly soft, All tube sockets should to be cleaned. 5U4G needs replacing to operate. Paint very good, nice cosmetics, (bottom scratched). Very well done mono tube and excellent noise floor less than 5 mV. #8+ condition.