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.
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