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 85

The MR85 AM/FM Tuner is an elegant instrument that allows
you to enjoy outstanding music reproduction. It includes
a wide range of convenient operating functions to
enhance your listening experience. The classic McIntosh
MR85 will perfectly compliment a McIntosh System of
incomparable performance and style.

Performance Features
• Special FM RF Amplifier
Double-Diffused Metal Oxide Field Effect Transistor
(DMOS-FET) RF amplifier increases sensitivity and Cross
Modulation rejection.
• External AM RF Amplifier and Antenna
The included RAA1 Remote AM Antenna contains an electrostatically
shielded AM RF Amplifier Stage and can be
located in a remote area away from sources of interference
assuring the best possible reception.
• Flywheel Manual Tuning and Automute
A newly designed, optically encoded weighted flywheel
system makes ‘dialing in’ stations a breeze. Reminiscent of
the dial-cord flywheel tuning method found in classic
McIntosh Tuners. The MR85 automatically mutes when
manually tuning between stations, yet provides the ability
to be switched off when searching for very weak stations.
• FM Stereo Auto Blend Circuitry and Spatial Sound Enhancement
An automatic variable stereo separation control circuit is
used to reduce background noise when receiving weak stereo
stations. A sound Spatializer circuit can be selected for
Tuner 1 Enhancement. This circuit can expand the sound
field for FM stations with poor separation; it also provides
a pseudo-stereo effect for AM stations.
• Optional Second Tuner Module
The McIntosh TM1 Tuner Module may be added to the
MR85 by your Dealer and is the most economical way to
add a second tuner to a system. This is ideal for applications
where two tuners may be used at the same time, such
as Multizone Systems or listening to one station while recording
another station.
• Preset Stations and Custom Preset Naming
Nine AM and nine FM station presets with custom naming
(any desired name may contain up to eight characters) for
each tuner module make it easy to listen to your favorite
stations. For example, FM Preset Number 3 (92.50MHz)
can be renamed “JAZZ 7”, or “WXYZ”. The station presets,
custom naming and functions modes are retained in
Permanent Memory even when AC power is turned off.
• Alphanumeric Fluorescent Display
The Multifunction Front Panel Display indicates station
frequency, station preset number, custom naming, signal
strength, stereo and broadcast band. The display intensity is
fully adjustable.
• Adjustable Output Level and Remote Control Capable
Both Tuner 1 and the optional Tuner 2 have Variable Outputs
which can be used to match audio levels between various
sources. When used in conjunction with a McIntosh
Control Center or Multizone Controller, tuning functions
can be performed with a remote control.

FM Tuner Specifications

Useable Sensitivity: 14dBF which is 1.4uV across 75 ohms
50dB Quieting Sensitivity:
Mono: 19dBF which is 2.4uV across 75 ohms
Stereo: 35dBF which is 15uV across 75 ohms
Signal To Noise Ratio:
Mono: 75dB
Stereo: 70dB
Frequency Response:
Mono: + 0, - 1dB from 20 to 15,000Hz
Stereo: + 0, - 1dB from 20 to 15,000Hz
Harmonic Distortion:
Mono: 0.3% at 100Hz
0.3% at 1,000Hz
0.3% at 10,000Hz
Stereo: 0.45% at 100Hz
0.45% at 1,000Hz
0.65% at 10,000Hz
Intermodulation Distortion:
Mono: 0.25%
Stereo: 0.45%
Capture Ratio: 1.2dB
Alternate Channel Selectivity: 75dB
Spurious Response: 100dB
Image Response: 75dB
RF Intermodulation: 65dB
Stereo Separation:
45dB at 100Hz
45dB at 1,000Hz
35dB at 10,000Hz
SCA Rejection: 65dB

AM Tuner Specifications
Sensitivity: 20uV External Antenna Input
Signal To Noise Ratio:
48dB at 30% modulation
58dB at 100% modulation
Harmonic Distortion: 0.5% maximum at 50% modulation
Frequency Response: 50Hz to 6kHz NRSC
Adjacent Channel Selectivity: 45dB minimum IHF
Image Rejection: 65dB minimum from 540kHz to 1600kHz
IF Rejection: 80dB minimum

General Specifications
Rated Output:
Fixed output: 1.2 Volts
Variable output: 0 - 1.2 Volts
Output Impedance: Less than 100 ohms
Power Requirements:
100 Volts, 50/60Hz at 20 watts
110 Volts, 50/60Hz at 20 watts
120 Volts, 50/60Hz at 20 watts
220 Volts, 50/60Hz at 20 watts
230 Volts, 50/60Hz at 20 watts
240 Volts, 50/60Hz at 20 watts
Note: Refer to the rear panel of the MR85 for the correct voltage.
Overall Dimensions:
Width is 17-1/2 inches (44.5cm)
Height is 6 inches(15.3cm) including feet
Depth is 19 inches (48.3cm) including Front Panel and Knob
25.5 pounds (11.6 Kg) net, 43 pounds (19.5 Kg) in shipping carton

Nessun commento:

Posta un commento