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MX110 TUNER PREAMPLIFIER
GENERAL DESCRIPTION
The MX110 combines in one unit an ex-
tremely low-distortion preamplifier with a
highly sensitive FM multiplex stereo tuner.
Every desirable feature of a tuner and a pre-
amplifier is included in this design. Inter-
station noise suppression, tuning indicator,
FM multiplex indicator, individual channel
bass controls, individual channel treble con-
trols, electronic phase switch have all been
engineered into the MX110. The INPUT
SELECTOR gives you a choice of six different
program sources. The MODE SELECTOR is a
newly developed control which makes it very
easy to balance a stereo system. It is de-
signed to add left to right for monophonic
operation, to control the left to right stereo
perspective or to compare the left and right
channels of a stereo program. The loudness
of the phono channels and the auxiliary
channel may be balanced to the tuner loud-
ness. These adjusting controls are located on
the top of the MX110 behind the front panel.
By releasing the PANLOC buttons on the
front panel, you can slide the MX110 out of
its mounting until the second latch engages.
The top mounted LEVEL set controls are
now available.
The Mclntosh designed PANLOC system
is the first professional installation technique
to be used on stereo instruments. The
PANLOC system gives you absolute ease of
installation, operation, and maintenance.
The Mclntosh MX110 is a beautifully
engineered control center for the finest
stereo sound systems. The extreme care in
manufacturing, in layout design and in ther-
mal engineering promises the usual Mclntosh
extra values of reliability, performance, and
long life.
TECHNICAL DESCRIPTION
The radio-frequency amplifier of the
MX110 is a "cascode" type circuit. The cir-
cuit is specially designed to amplify weak
signals with less noise and distortion. By
carefully tuning this RF amplifier during
manufacturing and controlling other circuit
constants, spurious response rejection is
improved. The high-frequency oscillator me-
chanical layout is engineered for minimum
response to temperature variations. In fact
the combination of mechanical and elec-
tronic design is so unusually good in this
circuit that automatic frequency control is
not needed in the MX110. The mixer output
is amplified by four flat-topped intermediate
frequency amplifiers. The transformers used
in the LF. amplifiers are designed for maxi-
mum adjacent channel rejection, for electri-
cal stability, and for electrical and mechanical
resistance to shock and vibration.
The R.F. and I.F. circuits of the MX110 are
completely shielded and exceed the FCC
requirements for suppression of oscillator
radiation. Either a 300 ohm or 75 ohm an-
tenna may be used with the MX110. A VHF
television antenna which is suitable for FM
reception can be connected to the MX110.
In the MX110, a new type of mechani-
cal tuning assembly gives smooth flywheel
tuning. By controlling the relations between
mass and mechanical resistance, and divid-
ing work loads in the dial drive system, it
becomes nearly impossible to detect any
backlash. Yet the entire dial drive is a model
of mechanical stability. For smooth, quiet
action and extended life with virtually no
wear, a teflon lined dial pointer carriage and
nylon pulleys are used in the dial cord as-
sembly.
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