Here we have an amazing condition McIntosh preamp made in 1955.McIntosh C 4 Audio Compensator. Tube. Mono.ELECTRICAL: Powered by McIntosh tube amplifiers or separate D 8 or D 8A power supply.FRONT PANEL: Selector: tape, tuner, mic, phono 1, phono 2. Comp: eur 78, col 78, aes, nab, riaa, col LP, lon LP, 629.16, 629.11, 800.16, 800.10. Bass. Treble. Volume with power switch. Power indicator light.REAR PANEL: Input level controls: tape, tuner, mic, phono 1, phono 2, Phono 2 load control with switch. Main and tape output. Power and output socket. 3 switched AC outlets.TUBES: 3-12AX7
SpecificationsFrequency response: 20Hz to 20kHzTotal harmonic distortion: 0.3%Gain: 52dB (MM), 32dB (line)Input sensitivity: 3mV (mic), 3mV (MM), 60mV (line)Output: 4V (Pre out)Dimensions: 11 x 4-1/4 x 7-3/4 inches