Performance Limits
PERFORMANCE GUARANTEE
Performance Limits are the maximum deviation
from perfection permitted for a McIntosh instru-
ment. We promise you that the MR 73 you buy
must be capable of performance at or exceeding
the limits or you get your money back. McIntosh
is the only manufacturer that makes this guarantee.
.
FM
USEABLE SENSITIVITY: 2.5 microvolts at 100%
modulation (±75 kHz deviation) for 3% total
noise and harmonic distortion in accordance
with IHF standards.
AUDIO FREUQENCY RESPONSE: ±1 dB 20 Hz to
20,000 Hz with standard de-emphasis (75
µSEC.) and 19,000 Hz pilot filter.
HARMONIC DISTORTION: Mono: 0.3% at 100%
modulation ±75 kHz deviation. Stereo: 0.7%
or less.
CAPTURE RATIO: 1.5% dB at 100% modulation.
MUTING: AF injected ultrasonic muting: 60 dB
noise reduction between stations.
OSCILLATOR DRIFT: 25,000 Hz in an ambient tem-
perature of 25° C.
IMAGE REJECTION: 80 dB at 90 MHz; 70 dB at
100 MHz.
HUM: 70 dB below 100% modulation.
OUTPUT: 2.5 volts; low impedance.
FM ANTENNA INPUTS: 300 ohms balanced; 75
ohms unbalanced.
IF: Two ICs and two phase linear crystal filters.
RADIATION: FCC requirements.
STEREO SEPARATION: 35 dB at 1,000 Hz.
STEREO FILTER: - d B noise reduction.
STEREO INDICATOR: Front panel multiplex stereo
light activated by 19,000 Hz carrier only';
SCA FILTER: 50 dB down at 67 kHz to 74 kHz, 275
dB per octave slope.
AUTOMATIC MONO-STEREO SWITCH: Mclntosh
developed; all electronic automatic mono-
stereo switching circuit.
SEMICONDUCTOR COMPLEMENT: 24Transistors,
22 diodes, 2 Integrated Circuits, 1 Indicator
Tube. .
AM
SENSITIVITY: 12 microvolts at 1,000 Hz (using the
external antenna input).
FREQUENCY RESPONSE: -6 dB at 5,000 Hz
HARMONIC DISTORTION: 1% at 30% modulation.
SELECTIVITY: - 3 0 dB at 10,000 Hz
IMAGE REJECTION: 60 dB at 1,000 kHz.
SIGNAL TO NOISE RATIO: 55 dB.
AM ANTENNA INPUTS: Built-in loopstick or ex-
ternal antenna switch selected.
POWER REQUIREMENTS: 117 Volts, 50/60 Hz, 25
Watts.
MECHANICAL SPECIFICATIONS
SIZE: Front panel: 16 inches wide by 5
1
/
16
inches
high; Chassis: 15 inches wide by 13 inches
deep, including PANLOC shelf and back panel
connectors; Knob Clearance: 1½ inches in
front of mounting panel.
WEIGHT: 24 pounds net, 36 pounds in shipping
carton.
FINISH: Front panel: Anodized gold and black
with special gold/teal panel nomenclature
illumination.
CHASSIS: Chrome and black.
MOUNTING: Mclntosh developed professional
PANLOC.
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