The MX 117 AM-FM
Stereo Tuner-Preamplifier concept is a total Mclntosh master control center
that allows you to select the matching Mclntosh power amplifier for your
individual requirements. All needed inputs such as two record players, two tape
recorders and auxiliary can be accommodated, along with the built-in AM-FM
stereo tuner. The advanced circuits and performance features of the Mclntosh MX
117 make it an ideal and especially convenient solution for the most
discriminating stereo listener.
FM AFL AUTOMATIC
FREQUENCY LOCK
The Automatic
Frequency Lock is a patented Mclntosh circuit that activates when you tune to
the center frequency of an FM station. A varacter diode fine tunes the tuner
with a correction voltage from the AFL circuit. When the center ON -station
vertical LED indicator lights, the AFL circuit is in operation and the tuner
stays locked to the signal. There will be no drift from this accurate tuning,
insuring minimum distortion and best overall FM performance.
2. ELECTRONIC FET
ANALOG INPUT SWITCHING
All critical input
switching is done electronically using field effect transistor analog switches.
The front panel selector simply switches small amounts of control DC voltage
which turn the FET analog switches on or off. Since the FET analog switches are
located near the input jacks, the length of interconnecting leads is much
shorter. This design eliminates switching noise as well as frequency loss
caused by the longer signal leads necessary in conventional circuits.
3. HEADPHONE—OUTPUT
AMPLIFIER
The built-in
headphone amplifier is capable of driving a pair of dynamic headphones with
less than 0.02% harmonic distortion. Because of its extremely low distortion
and power capability, it is also the main preamplifier output.
4. TRI-FREQUENCY
PROGRAM EQUALIZER
Three separate
controls allow the balance and response of musical information to be adjusted
with far more flexibility than with conventional tone controls. The center
frequencies of the controls are 30 Hz, 750 Hz and 10 kHz. Plus and minus 12 dB
of control is available. Use of the program equalizer controls does not affect
in the slightest the low noise, low distortion performance of the
tuner-preamplifier. When the equalizer controls are in their center detent or
flat position, their action is neutral and response of the tuner-preamplifier
is absolutely flat.
5. TRUE LOUDNESS
COMPENSATION
The MX 117 active
circuit loudness control is continuously variable with constant midrange gain
and operates independently of the volume control. The loudness contour is
accurately modeled after the Fletcher Munson family of "Equal
Loudness" curves. Use of this control restores proper perceived frequency
response at even the softest listening levels.
5. TRUE LOUDNESS
COMPENSATION
The MX 117 active
circuit loudness control is continuously variable with constant midrange gain
and operates independently of the volume control. The loudness contour is
accurately modeled after the Fletcher Munson family of "Equal
Loudness" curves. Use of this control restores proper perceived frequency
response at even the softest listening levels.
5. TRUE LOUDNESS
COMPENSATION
The MX 117 active
circuit loudness control is continuously variable with constant midrange gain
and operates independently of the volume control. The loudness contour is
accurately modeled after the Fletcher Munson family of "Equal
Loudness" curves. Use of this control restores proper perceived frequency
response at even the softest listening levels.
6. PRECISION
TRACKING VOLUME CONTROL
The volume control
manufactured for Mclntosh Laboratory is a step attenuator which has tracking
accuracy within 1 dB throughout its entire range. Such extremely accurate
matching is achieved through electronically controlled trimming of the
resistance material deposited on pairs of miniature printed circuits. Tracking
accuracy and quiet performance are permanently maintained.
Use does not affect
performance as in ordinary volume controls.
7. ELECTRONIC FET RF
SELECTIVITY SWITCHING
A back panel switch
gives additional FM RF selectivity for best performance in areas with extremel
strong station signal strengths. This switch feeds a control DC voltage to PIN
semiconductor diodes which electronically perform the RF switching functions.
AUTOMATIC STEREO
NOISE SUPPRESSION
A new third
generation phase locked loop stereo decoder incorporates a unique variable
stereo separation - noise reduction control circuit. This circuit operates from
the IF amplifier signa strength detector. When listening to weak or distant FM
stations, optimum stereo separation and signal to noise ratio is automatically
provided. You get a smooth transition between stereo and mono depending on the
prevailing signal conditions. This means that with the Mclntosh MX 117 you
always get the most noise-free reception of weaker stereo signals. Since this
circuit automaticallyadjusts in varying amounts, you never hearthe abrupt
switching present in conventional circuits.
UNIQUE AM TUNER
SECTION
The AM circuit in
the MX 117 is unique in designfor a superheterodyne tuner. The AM RF amplifier
circuit has constant selectivity, constant sensitivity and high image rejection
across the complete AM band. In addition there is no loss of audio frequency response
at the low end of the band. No conventional AM circuit can offer all these
features simultaneously. These advanced AM performance characteristics of the
MX 117 bring about a re-discovery of AM listening.
INTEGRATED CIRCUIT
OPERATIONAL AMPLIFIERS
Both the magnetic
phono and the equalizer amplifierstages utilize new high technology integrated
circuit operational amplifiers. Noise factors are incredibly low and distortion
levels are at or below the limits of the best present day test equipment.
PREAMP SECTION
FREQUENCY
RESPONSE: + 0 - 0.5 db from 20 Hz to 20
kHz
RATED OUT PUT LEVELS
Main Out : 2.5V
Line Out : 1.25V
Headphone : 750mV
Tape Out : 250mV
DISTORTION: 0.02% maximum at 2.5V output from 20 Hz to 20
kHz
INPUT SENSITIVITY
AND GAIN
Input to Main Out
Phone 1 and 2: 2.2mV in for 2.5V out (61.1 dB gain at 1 kHz)
AUX, Tape 1 and 2:
250mV in for 2.5V out (20 dB gain at 1 kHz)
Input to Line Out
Phono 1 and 2 :
2.2mV in for 1.25V out (55 dB gain at 1 kHz)
AUX, Tape 1 and 2 :
250mV in for 1.25V out (14 dB gain at 1 kHz)
Input to Headphone
Out
Phono 1 and 2: 2.2mV in for 750mV out (50.7 dB gain at 1
kHz)
AUX, Tape 1 and 2
250mV in for 750mV out (9.5 dB gain at 1 kHz)
Input to Tape Out
Phono 1 and 2: 2.2mV in for 250mV out (41.1 dB gain at 1
kHz)
AUX, Tape 1 and
2: 25pmV in for 250mV out (0 dB gain at
1 kHz)
SIGNAL TO NOISE
Phono 1 and 2: -90 dB IHF A-weighted, below 10mV input -80
dB unweighted, below 10mV input
AUX, Tape 1 and
2: - 100 dB IHF A-weighted, below 250mV
input
-90 dB unweighted,
below 250mV input
INPUT IMPEDANCE
Phono 1 and 2: 47kl2 and 50pF
AUX, Tape 1 and
2: 47kohm
OUTPUT IMPEDANCE
Main Out: less than 100ohm (to operate into 5kohm or
greater)
Line Out: 600ohm (to operate into a 600ohm line)
Headphone: 8ohm
Tape Out: less than 200ohm (to operate into 5kohm or
greater)
EQUALIZER CONTROL
RESPONSE
Center Frequencies
: 30, 750, and 10 kh
Boosr and Cut: ± 12 dB
AM SECTION
SENSITIVITY. 75μV 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
SENSITIVITY: 30 dB minimum IHF
IMAGE
REJECTION: 65 dB minimum from 540 kHz to
1600 kHz
FM SECTION
USABLE
SENSITIVITY: 2μV
(11.2dBf) IHF
QUIETING
SENSITIVITY: 5μV(19.1dBf)
IHF -50dB(Mono); 50μV (39.5dBf) 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
GENERAL INFORMATION
POWER
REQUIREMENT: 120 Volts 50/60 Hz, 45
Watts
SEMI CONDUCTOR
COMPLEMENT
24 Bipolar
Transistors
18 Field Effect
Transistors
62 Diodes
24 Integrated
Circuits
MECHANICAL
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:: 24 pounds (10.9 kg) net, 36 pounds (16.3 kg)
in shipping carton.
