McIntosh MR 7083

 The Mclntosh MR 7083 is a high quality AM/FM Tuner whose design has been governed by insistence on high performance with long life, great flexibility and sensitivity. You will derive the greatest enjoyment and most satisfaction from your MR 7083 when you understand its operations and functions. Your time invested now will return added value to you because you will get the best results from your MR 7083. Mclntosh has earned world renown for its technological contributions for improved sound. When you bought Mclntosh, you bought not only high technology, you bought technological integrity proven by time. The Mclntosh MR 7083 Tuner is continuing evidence of Mclntosh technological superiority and integrity.

Music reproducing instruments that carry the Mclntosh name have always been designed for technological leadership and to maintain the Mclntosh reputation for durability, long life, and best sound. Mclntosh has had to earn the foremost reputation for quality performance. Mclntosh has provided user-oriented facilities and appearance, and Mclntosh design provides for ease of maintenance or repair. These fundamental elements are incorporated in the Mclntosh MR 7083 AM/FM Tuner, the easiest to operate yet with extensive useful features. Your Mclntosh MR 7083, above all others, will deliver the best sound and the greatest ease of use with a high degree of flexibility.

 Some of the features that set the MR 7083 apart from the ordinary are:

The advanced AM/FM tuner design of the MR 7083 displays the station frequencies digitally. Stations are selected easily in any one of these ways:

A. use the manual tuning knob, B. use the SCAN up or down touchbuttons, C. use the preset station touchbuttons or, D. use the SEARCH which will preview the preset stations for 5 seconds each.

The sound enhancing SPATIAL audio processor provides an aural picture that is more "stereo like" in quality and dimension. On noisy, weak FM stations or AM stations, SPATIAL provides reduced noise and retains a broad stereo-like sound.

High quality tape recordings of FM broadcasts can be made without the interference that stereo transmissions can cause. Carefully designed suppression circuits eliminate the potential for stereo carrier noise when making "off the air" tape recordings.

A unique Phase Locked Loop Multiplex decoder delivers STEREO FM with lower distortion, lower noise, and better separation.

The most useful and flexible AM antenna system will suit your particular installation. A low-impedance loopstick will, in most local areas, provide AM signals while rejecting noise and interference. In noisy AM locations, an external noise reducing, noise canceling, shielded loop will provide ideal input signal. In a remote location, a conventional 'long wire' antenna can be used.

The MR 7083 can be remote controlled from a Mclntosh IR Remote Control system.

All in all, your selection of the MR 7083 will be reinforced by your day-to-day use of this superb instrument. Good listening.

Preset stations 

16 station memory presets are available 8 for AM and 8 for FM stations. preset memory is retained even when AC power is turned off

Three Modes of Tuning 

A traditional tuning knob as well as a push button scan and preset buttons are provided.

Digital Display 

Exact digital display of tuned frequency.

Center Tuning Lock 

Each time a frequency change takes place it locks on the center of the channel.

Auto Muting 

Automatic muting when changing stations.

Solid State Tuning Indicators 

9 LED Signal strength bar indicates signal strength. 3 LED signal centering display allows for precise center tuning ,

Versatile Outputs

Both fixed and variable audio outputs included

DMOSFET RF Amplifier 

Double Balanced Mixer and 4 RF circuits that are tuned by matched varactor diodes. The results are high spurious rejection and great sensitivity. This circuitry and high tuning voltage eliminate RF inter modulation distortion caused by diode nonlinearities. stations

FM IF Section 

The FM IF section uses 2 transistors, 3 linear phase piezoelectric filters, and 2 integrated circuits. They combine to provide over 120dB of gain and a selectivity greater than 70dB. Limiting, muting, signal strength drive, and FM detection are all functions of the LA 1235 integrated circuit..

Phase Locked Loop (PLL) Stereo Decoder 

A phase locked loop (PLL) stereo decoder integrated circuit, the TCA 4500A, is the heart of the multiplex section. It has a high signal to noise ratio, low distortion, high channel separation, and high SAC rejection. The PLL MPX IC eliminates inductors to minimize drift, provides integral lamp driving capability for stereo indication, and has transient free mono/stereo switching.

LC Tuned Notch Filter 

Following the PLL MPX decoder an LC tuned notch filter is used to prevent tape recorder bias interference. The LC filter is driven from the MPX output amplifier and is terminated by an operational amplifier. This provides the necessary filter input and output impedances for proper phase response.

Display Provisions 

Scope outputs allow an oscilloscope to be connected for viewing FM Multipath, station signal strength and center tuning accuracy.

Specifications

FM SECTION

USABLE SENSITIVITY:  11.25 dBF which is 1.0 μV across 75 ohms

50dB QUIETING SENSITIVITY:

Mono : 15 dBF which is 1.6 μV across 75 ohms

Stereo : 37 dBF which is 20 μV across 75 ohms

SIGNAL TO NOISE RATIO:

Mono : 80 dB

Stereo : 75 dB

FREQUENCY RESPONSE:

Mono :  from 20 to 15,000 Hz (+ 0, -1dB)

Stereo :  from 20 to 15,000 Hz (+0, - 1dB)

HARMONIC DISTORTION:

Mono :

0.08% at 100 Hz

0.08% at 1000 Hz

0.12% at 10,000 Hz

Stereo :

0.08% at 100 Hz

0.08% at 1000 Hz

0.12% at 10,000 Hz

INTERMODULATION DISTORTION:

Mono : 0.08%

Stereo : 0,12%

CAPTURE RATIO:  1.5 dB

ALTERNATE CHANNEL SELECTIVITY:  70 dB

SPURIOUS RESPONSE:  100dB

IMAGE RESPONSE:  80 dB

STEREO SEPARATION:  50 dB

AM SECTION

SENSITIVITY:  AM 20 μV external antenna input (50 ohm source input)

SIGNAL TO NOISE RATIO:

50 dB at 30% modulation

60 dB at 100% modulation

HARMONIC DISTORTION:  0.5% maximum at 30% modulation

FREQUENCY RESPONSE:  50 Hz to 6,000 Hz NRSC

ADJACENT CHANNEL SELECTIVITY:  45 dB minimum IHF

IMAGE REJECTION:  78 dB minimum

GENERAL INFORMATION

AUDIO OUTPUT:

Fixed:  1.2 V RMS at 100% modulation

Variable:  1.2 mV to 1.2 V at 100% modulation

SEMICONDUCTOR COMPLEMENT:

Transistors 37

Integrated Circuits 28

Varactors 8

LEDs 53

Diodes 74

POWER REQUIREMENT:  120V 50/60Hz

POWER CONSUMPTION:  10 watts

MECHANICAL INFORMATION

DIMENSIONS (W x H x D):  406 x 138 x 330 mm (16-1/8" x 5-7/16" x 13") from the mounting surface, including PANLOC shelf and back panel connectors. Knob clearance required is 1-1/4 inches (3.2 cm) in front of the mounting panel.

FINISH:

Front panel is glass with special gold/teal nomenclature illumination and black with gold anodized aluminum. Chassis is black.

MOUNTING:

Exclusive Mclntosh developed professional PANLOC

WEIGHT:   7.0 kg (15½ pounds) net;  12.5 kg (27½ pounds) in shipping carton