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)