McIntosh MR 71 - MR 71 Operating Instructions; Stereo FM Operation; Mono FM Operation

SPECIFICATIONS
Useable Sensitivity
2.5 microvolts at 100% modulation (±75KC
deviation) for less than 3% total noise and
harmonic distortion in accordance with
IHF standards.
Audio Frequency Response
Within Vidb from 20 to 20,000 cycles.
Distortion
Less than 0.5% at 100% modulation
±75KC deviation.
Capture Ratio
1.5db at 100% modulation.
Muting
IF injected ultrasonic muting: at least 60db
noise reduction between stations.
Oscillator Drift
Less than 25KC with AFC disabled; negligible
with AFC in operation.
Image Rejection
Better than 80db at 90MC; better than 70db
at 105MC.
Hum
Better than 70db below 100% modulation.
Output
Approximately 2.5 volts; low impedance.
Antenna Inputs
300 ohms balanced; 75 ohms unbalanced.
RF Amplifier
Cascode with 6DS4 Nuvistor in first stage.
IF Stages
Five, with 200KC bandwidth
Limiters
Two.
Radiation
Substantially below FCC requirements.
Multiplex Channel Separation
Better than 30db at 1000 cycles.
Multiplex Filter
Greater than 48db suppression of 19KC pilot
and 38KC carrier.
Multiplex Indicator
Front panel multiplex stereo light activated
by 19KC carrier-only.
Multiplex Type
Peak-detecting, self-matrixing detector.
SCA Filter
50db down at 67KC to 74KC 275db per
octave slope.
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