McIntosh MR-78 Just serviced & tested prior to this sale by Dewick Repairs

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.

Performance Features

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.

The is the best analog McIntosh tuner.

Condition is excellent except for a small rub-through of the silver plating on the back-right just above the interconnect jacks, reference the last picture: # 6. I did this while cleaning it in 2011.

Receipts from servicing by Audio Classics, performed by Richard Modaferri himself, in 2003, and most recently by DeWick Repairs, July 2015, are included in the box. Glass face was replaced because the original glass was broken when I shipped it to Terry DeWick. Inspected and tested. Everything works.

I don't have the original box, but it is double-boxed in a tuner box and is ready for shipping.

PayPal fees at my asking price are included, otherwise add 3.5% to the total of purchase price + $50.00 for shipping and insurance.

I will only FedEx ship to verified PayPal USA addresses.

Thanks for looking.