McIntosh MC-275VI Tube Power Amplifier

The McIntosh MC-275VI tube power amplifier generates 75 Watts per channel into 4, 8, or 16 Ohms to drive high-fidelity stereo loudspeaker systems. Operating with wide-bandwidth output transformers and KT88 output valves, this sixth-generation design provides generous dynamic headroom and low distortion for high-performance audio reproduction.

The Hi-Fi Centre Team Take

Living with the McIntosh MC-275VI introduces tangible operational precision through its illuminated valve array, providing clear visual status transitions from standby to ready. The amplifier maintains an exceptionally quiet noise floor, allowing micro-dynamics and fine acoustic decays to emerge cleanly during low-volume sessions. The presentation delivers natural midrange texture alongside controlled, authoritative low-frequency articulation across extended listening sessions.

Key Acoustic & Design Features

• Wide-Bandwidth Output Transformers: Deliver uniform frequency response and full 75-Watt output power across 4, 8, and 16-Ohm loudspeaker loads.
• Visual Valve Monitoring: Employs multi-colour LED backlighting to display real-time valve health and circuit status diagnostics.
• Low-Noise Circuit Topology: Suppresses background valve hiss to expose delicate low-level information against a silent backdrop.
• Authorised Dealer Coverage: Hi-Fi Centre is an authorised dealer for McIntosh, ensuring genuine factory warranty protection, authentic parts, and technical support.

Technical Specifications

• Brand & Model: McIntosh MC-275VI
• Component Type: Two-channel valve power amplifier
• Power Output: 75 Watts per channel into 4, 8, or 16 Ohms (Stereo); 150 Watts into 2, 4, or 8 Ohms (Mono)
• Valve Complement: 4 x KT88, 3 x 12AX7A, 4 x 12AT7
• Total Harmonic Distortion: 0.5% maximum from 250 milliwatts to rated output
• Frequency Response: 20 Hz to 20,000 Hz (+0, -0.5 dB); 10 Hz to 100,000 Hz (+0, -3.0 dB)
• Signal-to-Noise Ratio: 105 dB below rated output
• Dynamic Headroom: 1.2 dB
• Damping Factor: > 22
• Analogue Inputs: 1 x stereo balanced (XLR), 1 x stereo unbalanced (RCA)
• Dimensions (W x H x D): 54.6 cm x 21.6 cm x 30.5 cm
• Weight: 30.5 kg

Frequently Asked Questions

• Can the McIntosh MC-275VI be operated in monoblock mode?
  Yes. The amplifier features a bridged mono configuration mode that combines both channels to output 150 Watts into 2, 4, or 8-Ohm loudspeaker loads.
• What do the LED illuminated valve sockets indicate?
  The multi-colour LEDs provide visual circuit status diagnostics: illuminating amber during the initial warm-up sequence, green when the circuit reaches standard operating readiness, and red if the Sentry Monitor protection circuit detects an operational fault.
• Which preamplifier connections are supported?
  The MC-275VI accommodates both balanced XLR and single-ended RCA stereo interconnects, selectable via the side chassis control panel.
• What is the typical lifespan of the valves?
  The KT88 power output valves generally provide between 2,000 and 3,000 hours of performance, whilst the 12AX7A and 12AT7 small-signal input valves typically deliver between 5,000 and 10,000 hours under normal operating conditions.