McIntosh mr74 (1972-1982)

Name: McIntosh mr74
Brand: McIntosh

A solid-state FM stereo tuner with high-end performance and build quality, introduced as McIntosh's top-of-the-line model.

Overview

The McIntosh MR74 is a solid-state FM stereo tuner introduced in 1972 as the flagship model in McIntosh Laboratory's tuner lineup. It was replaced by the MR78 in 1975, though production continued until 1982. Known for its exceptional sensitivity, selectivity, and sound quality, the MR74 remains a highly sought-after tuner among collectors and audiophiles. It features a glass front panel, walnut wood cabinet, and a comprehensive meter display including tuning, signal strength, and center channel indicators.

Specifications

Frequency Range	88 to 108 MHz
Sensitivity (IHF)	1.8 µV
Sensitivity (IHF, 75 ohm)	1.8 µV
Sensitivity (IHF, 300 ohm)	3.6 µV
Signal-to-Noise Ratio	70 dB
Capture Ratio	1.5 dB
Alternate Channel Selectivity	80 dB
Image Rejection	90 dB
IF Rejection	100 dB
Spurious Rejection	100 dB
AM Suppression	60 dB
THD (Mono)	0.15%
THD (Stereo)	0.3%
Stereo Separation	40 dB
Frequency Response	20 Hz to 15 kHz ±0.5 dB
Output Level	2.5 V
Output Impedance	6800 ohms
Power Requirements	117 VAC, 60 Hz, 45 watts
Dimensions (W x H x D)	16 x 5-7/16 x 13-1/4 inches
Weight	28 lbs
AM Tuner Section Sensitivity	75µV IHF (external ant.)
AM Tuner Section Signal to Noise Ratio	45 dB IHF minimum; 55 dB at 100% modulation
Technology	Solid State
Original List Price	$849.00

Design

The MR74 uses a 4-gang tuning capacitor and a phase-locked loop (PLL) multiplex decoder for stereo demodulation. It features a glass front panel and is housed in a walnut wood cabinet. The front panel includes a tuning meter, signal strength meter, and center channel meter.

Context

The MR74 was the top-of-the-line McIntosh tuner when it was introduced in 1972 and was replaced by the MR78 in 1975. It is categorized under "Tuners" in the McIntosh product lineup.

Market

The MR74 is a highly sought-after tuner by collectors and is known for excellent build quality. However, it is known to have issues with the power supply capacitors, the multiplex decoder, and the tuning capacitor, which may require servicing after decades of use.