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[. . . ] FM STEREO TUNER
INTRODUCTION
MR 71
TABLE OF CONTENTS
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2 6 8 8
TECHNICAL DESCRIPTION FRONT PANEL INFORMATION BACK PANEL INFORMATION INSTALLATION CONNECTING Audio Outputs Stereophonic FM Multiplex Monophonic FM Remote Amplifiers Off-The-Air Recording Antenna Connections OPERATING INSTRUCTIONS Stereophonic FM Multiplex Monophonic FM ADJUSTMENTS Muting Threshold Dial Panel Lights Output Adjust GUARANTEE
CONTENTS
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12 12 12 12 13
OWNER'S MANUAL
MR71
THANK YOU
Judging from the stereo equipment you own, you rank high among discriminating music listeners. You are probably no freshman when it comes to stereo. Never-the-less we ask you to read and carefully follow these instructions to insure a successful partnership between you and your new stereo equipment. You now have "THE BEST. " Used properly you are in for thousands of hours of musical enjoyment. [. . . ] RF Amplifier Cascode with 6DS4 Nuvistor in first stage. IF Stages Five, with 200KC bandwidth, flat top response. Radiation Substantially below FCC requirements. Multiplex Channel Separation Better than 30db at 1000 cycles. Multiplex Filter Greater than 48db suppression of 19KC pilot and 38KC carrier. Multiplex Indicator Front panel multiplex stereo light activated by 19KC carrier-only. Multiplex Type Peak-detecting, self matrixing detector. SCA Filter 50db down at 67KC to 74KC 275db per octave slope.
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Automatic Mono-Stereo Switch An exclusive Mclntosh development; allelectronic automatic mono-stereo switching circuit. Tube and Semiconductor Complement 1-6DS4 Nuvistor, 1st RF. 1--6BN8, Muting Amplifier, Muting Detector, AVC Clamper. 2-6BL8, Left and Right, 1st and 2nd Audio Amplifiers. 1-6U8, MPX Amplifier, MPX Indicator Control. 1-MA113 (Transistor), MPX Indicator Lamp Switch. 2-1N542 Diodes, Wide Band Discriminator. 2--1N542 Diodes, Narrow Band Discriminator. 2-1N542 Diodes, Balanced Detector for MPX Indicator. Reduce distortion due to multipath reception. Improve stereo separation and the accuracy of your STEREO INDICATOR by reducing multipath reception. The MR 71 MULTIPATH INDICATOR shows distortion from multipath signal reception. Multipath reception causes the two beams on the indicator to fluctuate rapidly. When the antenna is rotated to the correct position, the indicator beams will remain steady. The
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An FM station is correctly tuned when the indicator is in the black area of the tuning indicator. [. . . ] The TUNING indicator pointer should be in the black area of the tuning indicator meter. When the MPX STEREO indicator is lit, the station is broadcasting a 19KC carrier for multiplex stereo. The MR 71 will automatically switch to stereo Mode. If a station is broadcasting monophonic FM program, the MPX STEREO indicator will remain off and the tuner will automatically switch to Mono Mode. [. . . ]
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MCINTOSH MR71 BROCHURE (703 ko)
