Tube design Mono block Power Amplifier (SN: 09209) Beautiful Silver brushed aluminum face with white VU meter, attenuator control, and 7 position bias control. RCA inputs , 2-4 Ohm & 6-8 ohm output posts. (no tubes supplied in this unit) Fully shop serviced, clean and calibration. Excellent condition cosmetics #8+ (few very minor top & side scuffs)