McIntosh MC 275 valve stereo power amplifiers

We have two of these MK4 and MK5 variants. We also have the C2300 valve pre amp to compliment. The McIntosh MC275 Mk5 is a 75-watt-per-channel stereo vacuum tube power amplifier that can also operate in a 150-watt mono parallel configuration. It features a polished stainless steel chassis, balanced and unbalanced inputs. MK5: Power Output: 75W per channel into 4, 8, or 16 ohms (stereo); 150W into 2, 4, or 8 ohms (mono) Frequency Response: 20Hz to 20,000Hz (+0 / -0.5dB) Total Harmonic Distortion: 0.5% maximum at any power level from 250 milliwatts to rated power Signal-to-Noise Ratio: 100dB to 105dB Damping Factor: Greater than 14 to 22 Tube Complement: 4x KT88 output tubes, plus a mix of small signal tubes like 12AX7A and 12AT7 Dimensions (W x H x D): 16.5" x 8.25" x 12" (42 cm x 21 cm x 30.5 cm) Weight: 67 lbs (30.5 kg) net MK4: The McIntosh MC275 MK IV is a two-channel vacuum tube power amplifier produced from 2004 to 2006. It features a polished stainless steel chassis, a dedicated power on/off switch, a rear-mounted detachable power cord socket, and delivers 75 watts per channel into 4, 8, or 16 ohms. Power output: 75 watts per channel in stereo mode (4, 8, or 16 ohms) or 150 watts total in mono bridged/parallel mode. Tube complement: Four KT88/6550 output tubes, three 12AX7A tubes, and four 12AT7/12AZ7 small signal drivers. Frequency response: +0, -0.5dB from 20Hz to 20,000Hz (+0, -3.0dB from 10Hz to 100,000Hz). Total Harmonic Distortion (THD): 0.5% maximum from 250 milliwatts to rated power. Signal-to-Noise Ratio: -100dB to -105dB below rated output. Dimensions: 12" wide x 7.5" to 8.25" high x 16" to 16.5" deep. Weight: 67 lbs (30.5 kg) net