McIntosh MR73 (1969–1971)

A solid-state AM/FM tuner with a single 6HU6 'magic eye' tube, produced by McIntosh from 1969 to 1971.

Overview

The McIntosh MR73 is a stereo solid-state AM/FM tuner introduced in 1969 and produced until 1971. It was McIntosh’s first solid-state tuner, featuring a fully solid-state signal path with one tube—a 6HU6 'magic eye'—used as a signal strength indicator. The unit has an anodized gold and black front panel and was originally priced at $549.00. Owners have noted its sophisticated design for the era and its appeal for those seeking analog tuning with minimal controls.

Specifications

Production years	1969 - 1971
Original price	$549.00
Weight	24 lbs
Dimensions	16 x 5.5 x 13 inches
Finish	anodized gold and black front panel
Output	2500mV
Type	Mono/Stereo Tuner
Tuning Bands	AM/FM
FM Useable Sensitivity	Better than 2.0uV (IHF)
FM Signal to Noise Ratio	Better than 70db
FM Harmonic Distortion	Less than 0.5%
FM Capture Ratio	Better than 2.0db
FM Selectivity	Better than 60db
FM Stereo Separation	Better than 35db at 400Hz
AM Useable Sensitivity	Better than 50uV

Design

The MR73 was McIntosh’s first solid-state tuner, using a solid-state signal path and a single 6HU6 'magic eye' tube for signal indication. All McIntosh tuners, including the MR73, were factory-aligned and tested to meet published specifications using high-precision equipment.

Market

Recent resale prices for the McIntosh MR73 have ranged from $490 to $899. A known issue reported by technicians is the absence of a stereo beacon lamp bulb socket or any provision for it. Owner and service manuals are available through various vintage audio resources.