User manual MCINTOSH MR71

[. . . ] FM STEREO TUNER INTRODUCTION MR 71 TABLE OF CONTENTS 1 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 9 9 9 9 9 9 9 11 11 11 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. 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. This gives you a brief outline of what each control and indicator does. [. . . ] More than sufficient output volume is available to feed power amplifiers as well as preamplifiers. A new type of mechanical tuning assembly gives the MR 71 extremely smooth flywheel tuning action. The tuning capacitor is driven directly, and in turn drives the pointer. A teflon lined pointer carriage and nylon pulleys reduce friction and wear to give an unusually smooth and quiet dial action. IF YOU ARE IN A HURRY Turn antenna so the eye is steady. Use stereo-auto position: will switch automatically from stereo to mono. Tune for center of black area. position for MPX reception. 3 SPECIFICATIONS Useable Sensitivity 2. 5 microvolts at 100% modulation (±75KC deviation) for less than 3% total noise and harmonic distortion in accordance with IHF standards. Distortion Lessthan0. 5%at 100% modulation ±75KC deviation Capture Ratio 1. 5db at 100% modulation. Muting IF injected ultrasonic muting: at least 60db noise reduction between stations. Oscillator Drift Less than 25KC with AFC disabled; negligible with AFC in operation. Multiplex Filter Greater than 48db suppression of 19KC pilot and 38KC carrier. Multiplex Indicator Front panel multiplex stereo light activated by 19KC carrier-only. SCA Filter 50db down at 67KC to 74KC 275db per octave slope. 4 Automatic Mono-Stereo Switch An exclusive Mclntosh development; allelectronic automatic mono-stereo switching circuit. 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 6 An FM station is correctly tuned when the indicator is in the black area of the tuning indicator. The action of the TUNING indicator is independent of station signal strength. VOLUME Controls volume level when the tuner is connected to the pair of jacks marked FRONT PANEL CONTROLLED. MODE SELECTOR POWER OFF brings the tuning to minimum distortion. The AFC action repeats itself each time the tuning dial is moved to a different station. If several stations are very close together on the dial, or if a desired station is very close to a much stronger station, a lower AFC setting is usually needed for best tuning. MUTING Turns off the tuner AC power and the AC outlet on the tuner back panel. MONO Provides monophonic FM at both pairs of left and right channel audio output jacks. STEREO AUTO The STEREO AUTO position provides both monophonic FM and FM multiplex stereo at the left and right channel audio output jacks. If mono broadcasting is resumed the MR 71 will automatically switch to FM monophonic. AUTO FREQ. CONTROL OUT OUT--This position turns off the muting to allow conventional tuning with interstation noise present. [. . . ] Since it is not convenient to continually change the position of the dipole, you may have to set it for minimum multipath on your favorite station. IMPORTANT Keep the dipole away from large metal objects or surfaces. OUTDOOR FM ANTENNA An outdoor FM antenna is recommended for best FM reception under all conditions. In fringe areas, a highly directional FM antenna used with a rotator will give the finest possible FM reception. Rotate the antenna until it points in the direction of the station or until it receives the best possible signal. [. . . ]