McIntosh MX 110 Owners Manual

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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. 1