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ATTENTION MCINTOSH TUNER AND TUNER PREAMP OWNERS
NOW Your McIntosh Tuner or Tuner preamp will perform even better (any model, any age). RICHARD MODAFFERI, an
independent consultant to Audio Classics, has agreed to do repairs, modifications and updates for customers of
AUDIO CLASSICS.His intimate knowledge of the circuits allow him to improve the units audibly and measurably beyond
their original performance limits. Your investment in this service is protected by a limited one year parts and labor
guaranty.
Here is a list of some of the changes that may be made in your unit:
Modafferi Mod
- Install Hysteresis Modification
- Modify IF amplifier output stage to reduce IF noise radiation at 9th and 10th harmonics of IF (96.3 MHz and 107.0 MHz)
- Replace all audio coupling and bypass capacitors in the feedback circuits with High Quality Metalized polypropylene capacitors
- Install bypass caps in the power supply (Tube Units)
- Modify the Stereo Decoder to improve Stereo Separation
- Modify the Stereo Decoder for higher Slew rate and Stereo Separation
- Optimize pilot carrier limiter circuit
- Change muting and 19 KHz circuits for more reliable muting and stability of the stereo decoder (Tube Units)
- Re-route IF cable from IF chassis to detector to eliminate tailbiting at 96.3 and 107.0
- Modify Narrow Filter to accept over modulating stations.
- Front end modified for higher RF selectivity
- Adjust IF gain
- Perform complete RF, IF and MPX alignment
- Convert to 220 Volt operation - if required
- Change de-emphasis to European Standard - if required
- Listening check
- Install Cardas output connectors
- Unit will now exceed original factory specifications
- Run performance graphs
- Clean chassis, controls, panel and knobs
- Unit signed and dated (inside) by Richard Modafferi
- Selectivity modification
Investment: Tuner Approx. $700, Tuner-Preamps Approx. $900
Turnaround Time: Approx. 3 weeks
All changes are not applicable to every unit
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Richard Modafferi
, inventor and independent consultant to AudioClassics, has established himself as one of the world's foremost
authorities on tuner & loudspeaker design and development. He holds Masters degrees in Electrical Engineering and Computer
Science from the NJ Institute of Technology. A Senior Engineer at McIntosh Laboratories from 1968-74, he designed the MR77
and MR78 tuners and the famous "Rimo" filter. The MR78 tuner has received world wide acclaim for its State of the Art
performance. From 1974 to the present, Richard has been a self employed inventor at Modafferi Acoustical Systems, Inc. He
has been granted a United States patent for Phase Shift Bass Loading and for the Infinite Slope Crossover. Richard also serves as a writer,
reviewer and test lab for Audio, Audio Critic, The Sensible Sound.
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