Specifications

COMPACT, FLEXIBLE - MASTER CONTROL
WITH SUPERIOR AM/FM TUNING
THE MCINTOSH MX 117
AM-FM STEREO TUNER-PREAMPLIFIER
Match the Mclntosh Stereo Tuner-Preamplifier
with the Mclntosh power amplifier that satisfies
your room and musical requirements. Advanced cir-
cuits and performance features make the Mclntosh
MX 117 ideal and especially convenient solution for
discriminating stereo listeners.
FM AFL AUTOMATIC FREQUENCY LOCK
Automatic Frequency Lock is a patented
Mclntosh circuit that activates when the center fre-
quency of an FM station is tuned. A varacter diode
accurately tunes to the precise center of the station.
When the vertical LED indicator lights, the AFL cir-
cuit is in operation and the tuner stays locked to the
center of the station tuned. There will be no drift, in-
suring minimum distortion and best overall FM per-
formance.
ELECTRONIC FET ANALOG INPUT SWITCHING
All critical input switching is done electronically
using field effect transistor analog switches. The
front panel selector controls DC voltages which turn
the FET analog switches on or off. Since the FET
analog switches are located near the input jacks,
potential for noise pickup is reduced.
HEADPHONE—OUTPUT AMPLIFIER
The built-in headphone amplifier has less than
0.02% harmonic distortion. It is capable of driving a
pair of dynamic headphones. Because of its ex-
tremely low distortion and power capability, it is
also the main preamplifier output.
THREE BAND TONE SHAPING CONTROLS
Three separate controls allow 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, ± 12 dB of control capability. Use of the
program equalizer controls does not affect 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.
TRUE LOUDNESS COMPENSATION
The MX 117 loudness control is continuously
variable with constant midrange gain. It is an active
circuit that operates independently of the volume
control. The 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.
HIGH ACCURACY TRACKING VOLUME CONTROL
The volume control is a step attenuator which has
tracking accuracy within 1 dB throughout its entire
range. Such extremely accurate matching is achiev-
ed through electronically controlled trimming of the
resistance material deposited on pairs of miniature
printed circuits. Tracking accuracy and quiet perfor-
mance are permanently maintained. Use does not af-
fect performance as in ordinary volume controls.
AUTOMATIC STEREO NOISE SUPPRESSION
A new third generation phase locked loop stereo
decoder incorporates a unique variable stereo
38