Vintage McIntosh MC275 Stereo Power Amp KT88 / 6550 / 12AX7 Tubes Tech Tested $2900
This listing is for a McIntosh MC275, the iconic stereo amplifier from the high-end audio manufacturer. This model has been remanufactured over the years, but this piece is one of the originals. It uses 6550 / KT88 tubes and features three, large power transformers.
Two-channel, tubed stereo (switchable to parallel mono operation) power amplifier.
Tube complement: four KT88, three 12AX7A, four 12AT7.
Inputs: 1 pair single-ended (RCA), 1 pair balanced (XLR).
Loudspeaker outputs: separate gold-plated, 5-way binding posts for 4, 8, and 16 ohms.
Preamp output: 1 pair single-ended (RCA).
Inputs: 1 pair balanced (XLR), 1 pair single-ended (RCA).
Output power: 75Wpc (18.8dBW) into 4, 8, or 16 ohms (stereo), 150W into (21.8dBW) 2, 4, or 8 ohms (mono). Frequency response: 20Hz–20kHz, +0/–0.5dB; 10Hz–70kHz, +0/–3dB.
Signal/noise ratio: 100dB, A-weighted (no reference level given).
THD: 0.05% at any power level from 250mW to rated power output.
Input sensitivity: 1.2V unbalanced, 2.5V balanced. Input impedance: 90k ohms unbalanced, 180k ohms balanced. Damping factor: >14 (wideband).
Power consumption: 170W (idle), 360W (full power).
Dimensions: 16.5" (420mm) W by 8.25" (210mm) H by 12" (305mm) D. Weight: 67 lbs (30.5kg) net, 75 lbs (34.1kg) shipping.
Warranty: 3 years parts & labor, 90 days tubes.
Manufacturer: McIntosh Laboratory