McIntosh MX113 Tuner-Preamplifier (1967)

The McIntosh MX113 is a landmark model in McIntosh Laboratory's history, representing one of the company's earliest forays into integrated tuner-preamplifier design. Introduced in 1967 and produced through 1977, the MX113 combined high-fidelity FM/AM reception with a fully-featured preamplifier section, setting a benchmark for performance and versatility in its era. With its iconic glass front panel, illuminated meters, and robust build quality, the MX113 remains a sought-after component among vintage audio enthusiasts and McIntosh collectors.

Specifications

Feature	Specification
Year of Production	1967–1977
Type	Integrated Tuner-Preamplifier
Power Output	Preamplifier only (no internal power amplifier)
Inputs	4 high-level (line), 2 phono (MM/MC selectable)
Outputs	Fixed and variable preamp outputs
Input Impedance	47k ohms (line), 47k ohms (MM), 1k ohms (MC)
Output Impedance	600 ohms (balanced), 150 ohms (unbalanced)
Sensitivity	2.5mV (MM phono), 0.3mV (MC phono), 1.8μV for 20dB quieting (FM)
Tuner Bands	FM, AM (with multiplex stereo decoding)
Tone Controls	Bass, treble, loudness contour, balance
Special Features	Mode/monitor switch, headphone output, illuminated tuning and signal strength meters
Power Supply	Linear transformer-based
Dimensions (W×H×D)	19" × 6.5" × 15.5"
Weight	28 lbs (12.7 kg)
Finish	Black glass front panel with illuminated McIntosh logo, brushed aluminum side panels

Key Features

The MX113 was engineered to deliver both exceptional tuner performance and flexible preamplification in a single chassis. Its standout features include:

Dual Phono Inputs: Switchable between Moving Magnet (MM) and Moving Coil (MC) cartridges, making it compatible with a wide range of turntables.
FM Multiplex Stereo Decoder: One of the early receivers to include stereo FM decoding, allowing for true stereo broadcast reception.
Illuminated Meters: A large center tuning meter and signal strength indicator provide visual feedback, enhanced by soft blue-green illumination.
Loudness Contour & Tone Controls: Offers precise tonal shaping while maintaining McIntosh’s signature clarity.
Headphone Output: High-quality amplifier circuit designed for private listening.
Panloc Mounting System: McIntosh’s proprietary internal mounting system that isolates sensitive components from vibration and chassis stress.

Historical Significance

The MX113 marked a pivotal moment in McIntosh’s product evolution. Prior to its release, most high-end systems used separate preamplifiers and tuners. The MX113 integrated these functions without compromising performance, appealing to audiophiles seeking both convenience and quality. Its glass front panel and illuminated branding became design hallmarks that defined McIntosh’s aesthetic for decades.

As one of the first models to feature the company’s multiplex stereo decoder, the MX113 played a role in popularizing FM stereo broadcasting in the late 1960s and 1970s. Built with point-to-point wiring and premium components, it exemplifies the craftsmanship and engineering rigor that earned McIntosh its legendary reputation.

Sound Signature

The MX113 delivers a clean, neutral, and highly detailed sound with a low noise floor—characteristic of McIntosh’s design philosophy. The FM tuner section is particularly praised for its clarity, stereo imaging, and sensitivity. The preamplifier imparts a subtle warmth without sacrificing transparency, offering a balanced and musical presentation across genres. The phono stage handles both MM and MC cartridges with authority, preserving dynamics and fine detail.

Maintenance and Restoration Tips

Due to its age, the MX113 requires careful evaluation and potential servicing to perform optimally:

Capacitor Replacement: Electrolytic capacitors in the power supply and audio path degrade over time. A full recapping is recommended for reliability and sound quality.
Cleaning Controls and Switches: Use high-quality contact cleaner on tone controls, input selectors, and switches to eliminate crackling or channel imbalance.
Tuner Alignment: The FM/AM tuner may require realignment by a technician familiar with vintage equipment to restore optimal reception.
Lamp Replacement: The tuning and signal strength meters use small incandescent lamps. These can be replaced with modern LED equivalents (with proper voltage regulation) for longer life.
Multiplex Decoder Check: Ensure the stereo decoder is functioning correctly; faulty transistors or capacitors in this circuit can cause mono output or distortion.
Bias and Calibration: For MC input accuracy, verify gain stages and calibration during servicing.

Regular use and proper ventilation help preserve the MX113’s performance. Avoid prolonged storage in damp or dusty environments.

Market Value and Collectibility

The McIntosh MX113 holds steady value in the vintage audio market, with prices ranging from $400 to $800, depending on condition, originality, and restoration quality. Fully serviced units with working meters and stereo decoding command the higher end of the range.

Collectibility Rating: 7/10

Its significance as an early integrated McIntosh tuner-preamplifier, combined with its elegant design and solid performance, makes the MX113 a desirable piece for collectors. While not as rare as some limited-production models, its role in McIntosh history ensures lasting appeal.

Conclusion

The McIntosh MX113 is more than just a vintage receiver—it’s a testament to the golden age of high-fidelity audio. Combining advanced tuner technology, a versatile preamp, and timeless design, it remains a functional and beautiful centerpiece for any classic audio system. With proper care and maintenance, the MX113 continues to deliver the performance and pride of ownership that McIntosh is known for.