McIntosh MR71 (1963–1969)
A tube-based FM multiplex tuner from McIntosh, engineered for high sensitivity and precise stereo reception.
Overview
The McIntosh MR71 is a vacuum tube FM multiplex tuner produced between 1963 and 1969. Built in Binghamton, NY, it was designed as a high-performance receiver for stereo FM broadcasts, featuring advanced signal management for its era. It uses a solid state rectifier and incorporates McIntosh’s own ultrasonic muting circuit to reduce noise during weak signal conditions. Known for its precision engineering, the MR71 was built to deliver reliable, high-fidelity tuning with features like multipath indication, automatic frequency control (AFC), and muting.
Specifications
| Product type | FM Multiplex Tuner |
| Production years | 1963–1969 |
| Tubes | 6DS4 |
| Rectifier type | Solid state rectifier |
| Features | Multipath indicator, AFC, and Muting |
Design
The MR71 uses a tube-based design and is described as a "precision engineered, highly sensitive FM Multiplex" tuner. It includes a McIntosh-developed ultrasonic muting circuit to silence unwanted noise during signal dropouts.
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