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