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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





McIntosh MR 75

 The Mclntosh MR 75 AM-FM Stereo Tuner is a superb tuner using the latest high technology circuits. This fine tuner will discover more FM stations with good quality than ever before.

 FM AUTOMATIC FREQUENCY LOCK
The Automatic Frequency Lock (AFL) is a patented Mclntosh circuit that activates when you tune to the center frequency of an FM station. When the center ON-STATION vertical LED indicator lights, there will be no drift from accurate tuning, insuring minimum distortion and best performance.

AUTOMATIC STEREO NOISE SUPPRESSION
When listening to weak or distant FM stations, optimum stereo separation and signal to noise ratio is automatically provided by a third generation phase locked loop stereo decoder.

UNIQUE AM TUNER SECTION
The AM tuner's design is unique for a superheterodyne receiver. It has constant selectivity, constant sensitivity and high image rejection across the band. There is no loss of frequency response at the low end of the band, the only AM circuit with all these performance features.



PERFORMANCE LIMITS AND RATINGS FM SECTION
TUNING:  88 to 108 MHz
ANTENNA INPUTS:  One 300W balanced and one 75W unbalanced.
INTERMEDIATE FREQUENCY:  10.7 MHz
USABLE SENSITIVITY:  2mV (11.2 dBf) IHF
QUIETING SENSITIVITY:
5mV (19.1 dBf) IHF -50 dB (Mono)
50mV (39.5 dBf) IHF -50 dB (Stereo)
SIGNAL TO NOISE RATIO:  70 dB IHF minimum both Mono and Stereo
HARMONIC DISTORTION:
0.18% (Mono) IHF maximum
0.38% (Stereo) IHF maximum
ALTERNATE CHANNEL SELECTIVITY:  75 dB IHF minimum
IMAGE REJECTION:  100 dB IHF minimum
STEREO SEPARATION:  45 dB minimum at 1 kHz
AUDIO FREQUENCY RESPONSE:  20 Hz to 15 kHz +0, -1 dB
CAPTURE RATIO:  1.8 dB
SELECTIVITY:  75 dB IHF minimum
SPURIOUS REJECTION:  100 dB IHF minimum
SCA REJECTION:  60 dB minimum
AM SECTION
SENSITIVITY:  75mV IHF with external antenna
SIGNAL TO NOISE RATIO:  45 dB minimum IHF or 55 dB at 100% modulation
FREQUENCY RESPONSE:  + 0 -6 dB from 20 Hz to 3500 Hz
HARMONIC DISTORTION:  0.8% maximum at 30% modulation
ADJACENT CHANNEL SELECTIVITY:  30 dB minimum IHF
IMAGE REJECTION:  65 dB minimum from 550 kHz to 1600 kHz
GENERAL INFORMATION
AUDIO OUTPUT:
Variable:  2.5V into 47kW
Fixed:  1V into 47kW
AUDIO HUM:  75 dB down from 100% modulation
POWER REQUIREMENT:  120 Volts 50/60 Hz, 20 Watts
SEMI CONDUCTOR COMPLEMENT:
22 Bipolar Transistors
4 Field Effect Transistors
23 Silicon Diodes
15 Integrated Circuits
19 LED's
2 Bridge Rectifiers
MECHANICAL INFORMATION
SIZE:
Front panel measures 16 inches wide (40.6 cm) by 5 7/16 inches high (13.8 cm). Chassis measures 14
3/4 inches wide (37.5 cm) by 4 13/16 inches high (12.2 cm) by 13 inches deep (33 cm), including connectors.
Knob clearance required is 1 1/4 inches (3.2 cm) in front of mounting panel.
FINISH:  Front panel is anodized gold and black with special gold/teal nomenclature illumination. Chassis is black.
MOUNTING:  Exclusive Mclntosh developed professional PANLOC
WEIGHT (net):  10,43 kg (23 pounds)


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