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McIntosh C-20 PreAmp - $1,950 (belmont)
1021 Alameda De Las Pulgas near Ralston Ave
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This unit has been in the family since purchasing it new in 1974. My dad maintained it perfectly throughout the years and I’ve had it for the last 10 years playing it periodically.
Text or call me for a video sound clip.
Six five oh 400 nine eight eight 7
The sound is absolutely beautiful with classic McIntosh smoothness. It’s amazing because it sounds like a more accurate tube amplifier.
The McIntosh C-28 PreAmp is a vintage solid-state stereo preamplifier manufactured from 1970 to 1978, celebrated for its classic McIntosh design, build quality, and musical sound reproduction.
Main Features
• Inputs/Outputs: Four low-level inputs (including two phono), four high-level inputs, line outputs, two tape outputs, main outputs for stereo or mono blocks, RCA connections for high/low level inputs and line output.
• Headphone Amplifier: Integrated dedicated 20W headphone amplifier for high-quality personal listening.
• Controls: Input selector, individual left/right tone controls, dedicated volume and balance controls, with classic backlit glass faceplate and large polished knobs.
• Power Outlets: Includes both switched and unswitched AC receptacles, which allow powering high-current amps directly from the unit.
Technical Specifications
• Frequency Response: 20Hz to 20kHz.
• Total Harmonic Distortion: 0.1%.
• Gain: 62dB (MM), 20dB (line).
• Signal to Noise Ratio: 78dB (MM), 90dB (line).
• Input Sensitivity: 2.5mV (mic), 2mV (MM), 250mV (line).
• Weight/Dimensions: 11.34kg, 406 x 138 x 381mm with an anodized gold and black front panel.
• Build: 26 transistors, 4 diodes, 2 bridge rectifiers per unit.
Build and Condition (Marketplace Notes)
• Units for sale often come serviced, sometimes with original
paperwork and boxes, especially important for collectors.
• Cosmetic condition varies, but many samples present excellent faceplates, minor wear, and fully functional electronics following restoration or service.
• Prices commonly range from $1,400 to nearly $2,000 depending on condition, included accessories (such as wood case), originality, and whether the unit has been recently serviced.
Sound and Character
• Renowned for smooth, natural, and clean audio with a low noise floor and quality tonal control.
• Highly regarded among collectors and audiophiles for historical significance, sound quality, and robust design.
• Some vintage units may require service for common issues like scratchy volume controls or noisy transistors due to age, but parts are typically replaceable.
The C-28 remains a highly collectable piece of hi-fi history, ideal for enthusiasts seeking classic McIntosh sound and design in a preamplifier.