McIntosh MR 71 Brochure

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FINEST PERFORMANCE
[mo FINEST TUNER CRAFTSMANSHIP!

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TUNER

The McIntosh MR 71 is a precision engi-
neered, highly sensitive FM stereo tuner. Con-
tinual, exhaustive testing has made your tuner
the BEST.I You will hear all there is to hear
with the MR 71. The MR 71 has better per-
formance specifications than those required
of broadcast stations by the Federal Com-
munications Commission!

The research staff of Mclntosh has devel-
oped five circuit improvements for your listen-

ing enjoyment. One of these developments is .

automatic stereo/mono switching. The circuit
electronically switches to stereo when a sta-
tion broadcasts stereo. Electronic switching
is noise free. McIntosh developed electronic
switching will insure you the best possible

stereo under all conditions.

Another development makes tuning easiest
yet-the multipath indicator. The MR 71 is the
first tuner to offer an easy to use multipath in-
dicator. With multipath present FM signals
sound distorted and stereo signals can be
lost. The multipath indicator permits the ori-
entation of the antenna for the lowest possi-
ble multipath distortion.

Mclntosh offers you three years of trouble
free performance. With your MR 71 you are
offered a FREE THREE YEAR FACTORY
SERVICE CONTRACT. This means you cant
pay for the service of your MR 71 for three full
years. Transportation to and from the service
agency are the only limitations.

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USEABLE SENSITIVITY:

Better than 2.5 microvolts at 100% modulation (:75
kHz deviation) for less than 3% total noise and har-
monic distortion (IHF).

AUDIO FREQUENCY RESPONSE:

Within V2 dB from 20 Hz to 20 kHz including 75 micro-
second de-emphasis.

DISTORTION:

Less than 0.5% at 100% modulation :75 kHz devia-
tion.

MUTING:

IF injected ultrasonic muting: at least 69 dB quieting
between stations.

IMAGE REJECTION:

Better than 80 dB at 90 MHz better than 70 dB at 105
MHz.

HUM:

Better than 70 dB below 100% modulation.
OUTPUT:

Approximately 2.5 volts; low source impedance.
ANTENNA INPUTS:

300 ohms balanced; 75 ohms unbalanced.

IF AMPLIFIERS:

Five stages. with 200 kHz bandwidth.

TUNING INDICATORS:

Two, signal strength presentation and precise tuning
indication. New Darsonval movement meters of in-
creased sensitivity which do not need adiustment.
FM MULTIPATH RECEPTION INDICATOR:

An exclusive new McIntosh development; the elec-
tron ray tube indicates multipath distortion.
MULTIPLEX CHANNEL SEPARATION:

Better than 30 dB at 1000 Hz.

MULTIPLEX FILTER:
Greater than 48 dB suppression below 100% modu|a~
tion of 19 kHz pilot and 38 kHz carrier.

MULTIPLEX INDICATOR:
MPX stereo light activated by 19 kHz carrier only.

FRANCHISE]! DEALER

MULTIPLEX TYPE:
Peak-detecting, self-matrixing detector.

LIMITERS:
Two stages.

RADIATION:
Substantially below FCC requirements.

SCA FILTER:
50 dB down at 67 kHz-275 dB per octave slope.

AUTOMATIC STEREO-MONO:
An exclusive McIntosh development; all-electronic
automatic stereo-mono circuit (Pat. Pend.)

TUBE AND SEMICONDUCTOR COMPLEMENT:
1-6DS4 Nuvistor, Ist RF.

1-12AT7, 2nd RF and Mixer.

1-GBN4A, Oscillator.

1-6AU6, 1st IF.

1-6AU6, 2nd IF.

1-6AU6, 3rd IF.

1-6AU6, 4th IF and 1st Limiter.

1-2056, 5th IF, 2nd Limiter and Muting.

1-SBN8, Muting Amplifier, Muting Detector, AVO
Clamper.

2-ESBL8, Left and Right, 1st and 2nd Audio Amplifiers.
1-6U8, MPX Amplifier, MPX Indicator Control.
1-6HU6/EM87 Multipath Indicator.

1-12AU7, MPX Oscillator.

1-ST2-275, Voltage Reference.

1-2N3053, (Transistor) MPX Indicator Lamp-Switch.
2-IN542 Diodes, Narrow Band Discriminator.
4-IN542 Diodes, Balanced MPX Detector.

2-IN542 Diodes, Balanced Detector for MPX Indi-
cator.

2-Selenium Rectifiers, High Voltage Power Supply.
1-IN1217 Low Voltage Power Supply.

POWER CONSUMPTION:
70 watts, 105 to 125 volts, 50 to 60 Hz.

DIMENSIONS:

Front panel, 16 inches wide by 57/ inches high; chas-
sis (including PANLOC shelf) 15 inches wide by 5
inches high by 13 inches deep, including connectors;
clearance in front of mounting panel including knobs,
1/; inches.

WEIGHT:
Chassis only, 27 pounds. In shipping carton, 37
pounds.

mt I in 5 [1 LABORATORY INC.

2 Chambers St., Binghamton, N. Y.

PhoneiArea Code 607-723-3512

01584204