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McIntosh MR 75 Owner's Manual

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THE MR 75 AM/FM TUNER
Price $2.00
Reading Time: 32 Minutes

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Summary of Contents for McIntosh MR 75

  • Page 1 THE MR 75 AM/FM TUNER Price $2.00 Reading Time: 32 Minutes...
  • Page 2 WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. The Mclntosh you have purchased is a Model MR 75. It has a serial number located on the rear panel of the chassis. Record that serial number here:...

  • Page 3: Table Of Contents

    Your MR 75 AM/FM Tuner can give you many years of satisfactory performance. If you have any questions, please contact: Contents CUSTOMER SERVICE Mclntosh Laboratory Inc. 2 Chambers Street SERVICE CONTRACT INFORMATION Binghamton, New York 13903 INSTALLATION 2, 3 Phone: 607-723-3512...

  • Page 4: Installation

    1. Open the carton and remove the PANLOC brack- ets, hardware package, and mounting template. Re- move the MR 75 from its plastic bag and place it up- side down on the shipping pallet, then unscrew the four plastic feet from the bottom of the chassis.
  • Page 5 Saw the Panel Cutout each side, attach the PANLOC brackets to the cabi- Saw carefully on the inside of the penciled lines. First net panel; the short flange is mounted against the make the two long cuts and then the two short cuts. front (face) of the cabinet panel.

  • Page 6: How To Connect And Back Panel Information

    The flexible folded dipole antenna (300 ohm) sup- the wire in a straight line as high as possible. Attach plied with the MR 75 is for use in urban or high the wire at each end with suitable glass or ceramic in-...
  • Page 7 FM ANTENNA ALTERNATE AM ANTENNA OPTIONAL 75 ANTENNA LEAD-IN EXTERNAL GROUND TO AC POWER SOURCE MAXIMUM PERFORMANCE PREAMPLIFIER INDICATOR OSCILLOSCOPE POWER AMPLIFIER LEFT SPEAKER RIGHT SPEAKER...

  • Page 8: Front Panel Information And Use Of Controls

    It is recommended that a FUSE lighting arrester be used with an outdoor AM antenna. A 0.5 AMP fuse protects the MR 75 circuits. The The arrester should be well grounded to a ground rod fuse does not protect additional equipment con- or cold water pipe.
  • Page 9 FRONT PANEL INDICATORS easy but can cause the MR 75 to not return to the FM The MR 75 has three dial scales: 1. AM - marked 550 station when power is turned off and on again. This to 1600 kHz; 2. FM - marked 88 to 108 MHz; 3. Logging condition can be avoided if, when tuning in a station, scale 0 to 100.

  • Page 10: Performance Limits

    Performance limits are the maximum deviation from perfection permitted for a Mclntosh instrument. We 30 dB minimum IHF promise you that when you purchase a new MR 75 Image Rejection from a Mclntosh Franchised dealer it will be capable 65 dB minimum from 550 kHz to 1600 kH of performance at or exceeding these limits or you can return the unit and get your money back.

  • Page 11: Performance Charts

    Performance Charts FM SIGNAL PERFORMANCE - 1 0 - 2 0 - 3 0 - 4 0 - 5 0 - 6 0 - 7 0 SIGNAL INPUT IN MICROVOLTS F.M. HARMONIC DISTORTION 100% MODULATION FREQUENCY IN HERTZ F.M. FREQUENCY RESPONSE AND STEREO SEPARATION + 10 - 1 0...
  • Page 12 A.M. FREQUENCY RESPONSE 80% Modulation - 2 0 - 3 0 - 4 0 FREQUENCY IN HERTZ AM MINIMUM USABLE SENSITIVITY (IHF) 1000 1100 1200 1300 1400 1500 1600 1700 FREQUENCY IN kHz AM SELECTIVITY AT 1000 kHz - 2 0 - 4 0 - 6 0 - 8 0...

  • Page 13: Technical Description

    Technical Description special systems, an automatic variable separation FM SECTION control circuit to reduce background noise when The radio frequency (RF) assembly houses the com receiving weak stereo stations, and tri-level digital plete FM-RF front end and part of the AM-RF circuitry. waveform generation which eliminates interference An eight section variable capacitor is the heart of the from SCA signals and from the sidebands of adjacent...
  • Page 14 To minimize hum, radiation, and thus improve ting an external antenna if desired. signal to noise ratio the MR 75 power transformer is To maintain the excellent image rejection and spur- triple shielded. Shielding includes a copper strap, a ious cross modulation rejection of the AM-RF ampli- silicon steel strap, and finally a steel outer shell.

  • Page 15: Block Diagram

    Block Diagram...
  • Page 16 McINTOSH LABORATORY INC. 2 CHAMBERS ST., BINGHAMTON, N.Y. 13903 607-723-3512 The continuous improvement of its products is the policy of Mclntosh Laboratory Incorporated who reserve the right to improve design without notice. Printed in U.S.A. 039281...