McIntosh MC275 Mk IV (2004–2006)
The MC275 Mk IV is the fourth iteration of McIntosh's tube amplifier, produced from roughly 2004 to 2006. It introduced balanced inputs and modern speaker connectors to the line. According to at least one period enthusiast listing, it remains the preferred model among the modern reissues.
The Mk IV sits on a stainless steel chassis. It added a power on/off switch that earlier versions lacked, and the power cord moved to a socket on the rear panel. The MC275 was first produced in 1961 and is widely considered one of the greatest tube amplifiers ever made. McIntosh has kept it in production in some form for decades. The original run lasted from 1961 to roughly 1972, and the Mk IV is one of several reissues that followed.
The Mk IV's own specification sheet is hard to pin down. The familiar figures are 75 watts per channel in stereo, 150 watts in mono, KT88 output tubes, and the Unity Coupled Circuit output transformer. They are well documented for the MC275 line generally, but period sources don't consistently break them out for the Mk IV specifically. Original pricing for this variant isn't recorded in the available material.
The record does show owners were happy with it. One Klipsch forum user reported replacing an MC250 with the MC275 Mk IV for both two-channel and home theater listening. A YouTube review from the period praised its sound and appearance. SoundStage! Hi-Fi noted that the original MC275 ran from 1961 to 1972, which helps place the Mk IV in the lineage.
Known specs
- Fourth iteration of the MC275, produced ~2004–2006
- Stainless steel chassis
- Added power on/off switch; power cord moved to rear socket
- First MC275 version with balanced inputs and modern speaker connectors
Beyond that, the Mk IV-specific record is thin. No dimensions, weight, frequency response, or distortion figures for this exact variant have surfaced in the research, and there is no collector pricing data either. The detailed paperwork seems to have been folded into the MC275 story as a whole.
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