The McIntosh C20 is a legendary 2-channel vacuum tube stereo preamplifier manufactured by McIntosh Labs between 1959 and 1966. Highly regarded by vintage audiophiles for its musical character and rich bass response, the C20 is unique for its complex dual-volume control architecture designed to minimize background noise. Because it was produced during a transitional era for vinyl records and hi-fi audio, it features extensive equalization controls for various phono curves and tape head playback.
Technical Specifications
The internal layout of the C20 essentially operates as two mono preamplifiers sharing a single chassis and power supply.
Tube Complement: Uses a total of 8 tubes. This includes five 12AX7 tubes, two 12AU7 tubes, and one 6X4 rectifier tube.
Frequency Response: ±0.5 dB from 20 Hz to 20,000 Hz.
Unique Vol Volume Scheme: Features two volume mechanisms per channel. One control manages the output level while the other attenuates the input source, allowing users to optimize the signal-to-noise ratio for lower floor noise.
Dimensions & Weight: Measures 15 5/8″ x 4 1/2″ x 12″ and weighs approximately 28.5 lbs.
