McIntosh MAC4275 (1988–1990)
A solid-state AM/FM stereo receiver delivering 75 watts per channel, built during McIntosh’s collaboration with a Japanese manufacturer in the late 1980s
Overview
The McIntosh MAC4275 is a 2-channel receiver designed and branded by McIntosh Laboratory, Inc., manufactured from 1988 to 1990. It shares its core audio performance with the MAC4200, delivering identical sound quality. The unit was built under McIntosh’s supervision with construction subcontracted to a Japanese firm, maintaining build quality consistent with other models in the brand’s lineup. It features direct-coupled circuitry and Power Guard protection to prevent distortion and speaker damage.
Specifications
| Year of Production | 1988–1990 |
| Power Specifications | 75 watts per channel (stereo) |
| Impedance | 4Ω, 8Ω, 16Ω |
| Key Features | McIntosh Autoformer output, solid-state design, glass front panel with illuminated logo, power guard protection, sentry monitor, bass and treble controls |
| Tuner Type | AM/FM Stereo |
| Technology | Solid State (SS), DC (Direct Coupled), PG (Power Guard) |
Design
The MAC4275 uses direct-coupled circuitry and includes Power Guard to limit distortion by detecting onset of clipping. The speaker switch for System 1 is bypassed, leaving Speaker 1 permanently connected, while Speaker 2 remains switchable. In some sections, particularly the power supply, capacitance values were increased over earlier designs to improve DC smoothing. The original main filter capacitors were computer-grade BHC units, though replacements during restoration often use Nichicon MUSE, Elna SILMIC II, or Panasonic FC/FR types.
Context
The MAC4275 was produced concurrently with the MAC4200, sharing the same audio performance and design philosophy. Both models were part of McIntosh’s late-1980s receiver lineup, targeting audiophiles seeking high-fidelity integrated solutions.
Market
One unit was listed for $895 in August 2023. Common issues include failure of the #1 speaker output—only #2 outputs working—and degraded electrolytic capacitors, which exceed their useful life and may fail open or short. Restoration typically includes replacing all electrolytics, cleaning controls with Deoxit, re-soldering amplifier boards, and alignment per the service manual.
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Related Models
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