Vintage professional Crown D150A amplifier. Channels tested clear and undistorted. Excellent option for driving a passive subwoofer, it can amplify straight down to DC with flat response and zero phase shift. Level controls treated with Deoxit. Likely a '79 or later release based on the square logo and IOC lamps. Low serial No., 27,362. Rated at 75 WPC into 8 Ohms (300 watts bridged). Shares patent and essential circuitry of the DC-300. We DO NOT know if power switch is original to this vintage or if was changed to a toggle style later. A true A+AB class amplifier and virtually indestructible with glass-epoxy PC boards and high-grade capacitors and resistors. NOTE: ALWAYS use fuses in speaker wiring. TEST in stereo BEFORE removing red seal over mono switch. Broken seals or blown finals voids returnability. You are buying decades-old electronics; expect performance and appearance as such. Assume additional service required for optimal performance. We cannot assist with your environment or setup so RTFM. Pictures part of description.