The MC3500 MK II is a true monoblock tube amplifier, delivering an astonishing 350 watts of continuous power from vacuum tubes—a rare achievement even by today’s standards. This is made possible by McIntosh’s legendary Unity Coupled Circuit, which allows the amplifier to deliver full rated power regardless of whether your speakers are 2, 4, or 8 ohms. The result is exceptional control, stability, and consistency, even with complex or inefficient loudspeakers.

The amplifier uses eight KT88 output tubes, driven by carefully selected small-signal tubes, all chosen for reliability and sonic purity. Despite its immense output, distortion remains remarkably low, preserving the warmth and musicality that tube enthusiasts love while maintaining tight, authoritative bass.

Sonic Character

Sonically, the MC3500 MK II strikes a rare balance between tube richness and solid-state-like grip. It offers:

• A wide, holographic soundstage with precise imaging

• Deep, controlled low frequencies with real physical impact

• Smooth, textured midrange that brings vocals and acoustic instruments forward naturally

• Extended, refined highs without harshness

This makes it equally convincing with intimate jazz recordings, large-scale classical works, and high-energy rock or electronic music.

Build Quality & Aesthetics

Every MC3500 MK II is built with McIntosh’s signature attention to detail. The polished stainless-steel chassis is mirror-finished, while the black glass front panel features the iconic blue watt meter, providing a visual reference to the amplifier’s immense power reserves. The exposed tubes glow warmly during operation, reinforcing the amplifier’s blend of vintage character and modern luxury.

Despite its classic look, the amplifier incorporates modern safety and reliability features, including McIntosh’s Power Guard technology to prevent tube overdrive and extend component life.

Heritage & Legacy

The original MC3500 gained legendary status when it powered the main stage at Woodstock in 1969, proving that tube amplification could deliver massive output on a grand scale. The MK II version honors that legacy while elevating performance to contemporary reference standards. It is designed not as a nostalgic reissue, but as a no-compromise statement amplifier for today’s high-end systems.

Key Features

• 350W monoblock vacuum tube amplifier

• Unity Coupled Circuit for 2, 4, & 8 ohm speakers

• Eight KT88 output tubes

• Power Guard® protection technology

• Iconic blue watt meter & black glass front panel

• Polished stainless-steel chassis

• Balanced & unbalanced inputs

• Inspired by the legendary 1969 MC3500