- Full service check.
- Cleaned controls and switches.
Power Requirements120V at 200 watts
Power output45 watts per channel into 8Ω (stereo)
Frequency Response20-20kHz (+0.5 -0.5dB)
Total harmonic distortion0.25%
Power Amp Noise-90dB
Signal to noise ratio70dB (phono), 75dB (line)
Input sensitivity2mV (phono/tape), 300mV (line)
Dual concentric tone controls+18dB to -18dB
LF Filter50Hz at 12dB/oct
HF filter5k at 12dB/oct
Phase Switch0 or 180
Left+Rightadjustable to 6V at 5kΩ
Output Impedance4Ω, 8Ω, 16Ω
Semiconductors23 x diodes, 34 x transistors, 2 x TRIAC
Dimensions16"w x 6"h x 13"d
The History of McIntosh
Founded in 1949, McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment...
[ Read More ]
The excellent operator's manual has a section on the loudness switch in which it correctly states that, when the volume is reduced, it is a characteristic of human hearing that the bass and treble decrease more rapidly than the midtonal range. Thus the loudness control automatically provides the bass and treble boost required to compensate for the change in response of the human ear at low loudness levels. In fact, as the loudness curves show, the circuit provides the appropriate amount of bass boost but it does not give any treble boost at any volume level. One can however correct the situation by slightly increasing the treble controls.