McIntosh MC3500 (1968–1971)
At 150 pounds, it doesn’t just sit on the rack—it commands the room, a brute-force statement in brushed aluminum and glowing glass.
Overview
The McIntosh MC3500 isn’t just an amplifier; it’s a relic of sonic artillery. Introduced in 1968, this monoblock vacuum tube amplifier was built for one purpose: to deliver massive, unrelenting power without surrendering the warmth and grace inherent to tube design.
It’s a single-channel (monoblock) design, meaning a pair was required for stereo operation, and its sheer size and weight reflect the extreme engineering within.
Later revived as the MC3500 Mk II, the design retained the core identity—Unity Coupled circuit configuration, high power output, and imposing physical presence—but with refinements. The Mk II version weighs in at a slightly leaner 121 pounds and is rated at 350 watts, meeting modern safety and performance standards while honoring the original’s legacy. Despite the decades between them, both versions share the same DNA: brute force married to precision, a rare balance that few amplifiers before or since have achieved.
Specifications
| Manufacturer | McIntosh |
| Model | MC3500 |
| Type | Monoblock vacuum tube amplifier |
| Production Years | 1968 to 1971 |
| Power Output | Over 300 watts (original), 350 watts (MC3500 Mk II) |
| Impedance | 2Ω, 4Ω, 8Ω |
| Frequency Response | +0, -0.5dB from 20Hz to 20,000Hz; +0, -3.0dB from 10Hz to 70,000Hz (MC3500 Mk II) |
| Circuit Configuration | Unity Coupled |
| Dimensions (W × H × D) | 18" × 11-13/16" × 21-5/8" (MC3500 Mk II) |
| Weight | 150 lbs (shipping, original), 121 lbs (MC3500 Mk II) |
Historical Context
Collectibility & Value
The original McIntosh MC3500 is widely regarded as a collectors’ item, with unrestored units listed for as much as $29,900. Its association with Woodstock, and sheer physical presence contribute to its legendary status. The modern MC3500 Mk II, while not vintage, commands significant value at €22,490, reflecting ongoing demand for the original’s performance in a reliable, supported package. Units described as meeting or exceeding original specifications—fully operational with all functions intact—are particularly sought after.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.
Related Models
- McIntosh C47 (2020-present)
- McIntosh C712 (1998-2002)
- McIntosh MAC4200 (1995-1999)
- McIntosh MC2002 (1993-1999)
- McIntosh MC2250 (1977-1980)
- Akai AM-2850 (1975)
- Akai AP-206 (1975)
- Nakamichi BX-1 (1985)
- Acoustic Research research-ar-17 (1978)
- Acoustic Research AR-19 (1994)