This McIntosh MR78 tuner is in excellent working order. The tuner has been calibrated and is spot on. The glass front is in perfect condition. Minor scrapes associated with age can be seen and their is pitting on the chrome around the fuse cap in the rear. The original manual is included. We do not have the wood case. The tuner will be well packed. The glass front will be removed and packed separately and guaranteed to arrive in one piece. The McIntosh MR78 is highly regarded for superior selectivity and sensitivity with low distortion. The MR78 was designed by Richard Modaferri and uses his patented RIMO filter, an IF passband filter with remarkable adjacent channel rejection and user selectable passbands.
Audio Classics has a limited number of these tuners that have been recently modified and aligned by the designer himself.
Multiple selectivity, normal, narrow and super narrow, switchable from the front panel. An elegant solution to a tough problem. Switching is done by means of diodes using DC switching; an ideal way to handle a difficult RF problem. A two position RF selectivity diode switching circuit for low and high gain antennas adds a useful parameter that is unique. One pair of balanced high level inputs and balanced outputs for all six outputs. Linear phase (constant delay) IF amplifier for low distortion at even high selectivity and low distortion. Patented two eight pole filters are selectable as well as a four pole multi element crystal in the super narrow position.
A phase linear bridge discriminator provides distortionless conversion from FM to audio and exhibits a capture ratio close to 0dB. No active elements are used, providing a driftless, ideal detector. Five element tuning capacitor improves RF front end characteristics; more tuned circuits for better selectivity. Silver plated chassis and RF coils for better shielding, lower losses and higher Q circuits. Highest spurious rejection 100dB (IHF) and highest image rejection 110dB (88 to 108 MHz). This means you receive the stations at only the right place on the dial. You don't receive the same stations, or some mixture, as you tune across the dial.
McIntosh developed a special detecting circuit used in the multiplex section. An advantage of this circuit is the elimination of the critical adjustments necessary with commonly used matrixing circuits. The circuit detects the L - R sidebands, then automatically matrixes the recovered information with the L - R carrier signal. This yields the left and right program output with maximum separation.
Decibel Audio is a retail store and custom installation business in the Wicker Park neighborhood of Chicago. We have serviced the Chicagoland area with new, used and vintage equipment for over 19 years. Visit our brick and mortar store at 1429 N Milwaukee Avenue, Chicago, IL 60622. Feel free to call us at 773-862-6700 between 12pm and 7pm CST.
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