MCintosh MC7270  one of our favorite vintage amplifier of black monster

Price $4770 / €  4674 used / second hand Description I call it a black monster power amp. Stereo 270 watts minimum sine wave continuous average power output, per channel, both channels operating into 1 ohm, 2 ohms, 4 ohms, or 8 ohms load impedance, which is: 16.4 volts RMS across 1 Ohms 23.2 volts RMS across 2 Ohms 32.9 volts RMS across 4 Ohms 46.5 volts RMS across 8 Ohms Mono bridge 540 watts minimum sine wave continuous average power output into 2 ohms, 4 ohms, 8 ohms, or 16 ohms load impedance, which is: 32.9 volts RMS across 2 Ohms 46.5 volts RMS across 4 Ohms 65.7 volts RMS across 8 Ohms 93.0 volts RMS across 16 Ohms Damping factor Greater than 30 Input impedance 20,000 ohms. Input  Sensitivity : 0.75 volt or 2.5 Volts level control provided for higher input voltages. Power guard Clipping is prevented and THD does not exceed 29% with up to 20 dB overdrive a 1 kHz. General Information Total harmonic distortion Stereo 0.02% maximum harmonic distortion at any power level from 250mWatts to 270 Watts per channel from 20 Hz to 20kHz, both channels operating. Semiconductor complement 79 silicon transistors 31 silicon rectifiers and diode 7 integrated circuits Weight 82 pounds (37.2 kg) net, 96 pounds (43.5 kg) in shipping carton. Notes e. The voltages enclosed in a box are signal voltages that are measured with a 2.5V, 1kHz signal connected to both channels of the input