User manual MCINTOSH MR77

[. . . ] THE MclNTOSH MR 77 SOLID STATE FM/FM STEREO TUNER Reading Time: 24 Minutes Price $1. 25 Your MR 77 FM/FM Stereo Tuner will give you many years of pleasant and satisfactory performance. If you have any questions, please contact: CONTENTS SERVICE CONTRACT . 12 CUSTOMER SERVICE Mclntosh Laboratory Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-3512 WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. Take Advantage of 3 years of FREE Service . . . [. . . ] AC POWER CORD Connect the AC power cord to a 117 volt, 50 to 60 Hz power line receptacle. The power used by the MR 77 is 35 watts. FUSE A 0. 5 AMP fuse protects the tuner circuits. This fuse 5 to a stereo control preamplifier which has its own master volume control. The right hand pair of AUDIO OUTPUT jacks, provides FRONT PANEL CONTROLLED audio signal. The program at these jacks is controlled by the MR 77 front panel VOLUME control. Use these output jacks to connect to external power amplifier, tape recorders, or any equipment which requires continuous front panel control of tuner output volume. Front Panel Information TUNING DIAL The MR 77 has two dial scales: 1. Logging scale--Marked 0 to 100 The logging scale can be used to accurately retune any station. You may find it easier to keep a record of your favorite stations by use of the logging scale. A small portion of dial pointer has been illuminated to increase the ease of tuning. INDICATORS There are four indicators on the MR 77 dial panel. They are: STEREO indicator, MULTIPATH indicator, SIGNAL STRENGTH meter, and the TUNING meter. MULTIPATH INDICATOR The MULTIPATH indicator is an exclusive Mclntosh development. The proper use of the MULTIPATH indicator makes it possible to improve FM reception with precise FM antenna positioning. An electron ray indicator is used to show multipath reception. It operates by movement of electron beams inside a vacuum tube. When rotating the antenna, ob- servation of the multipath indicator will show best orientation for the FM station being received. Multipath distortion causes the two beams on the indicator to fluctuate rapidly. When the antenna is rotated to the best position, the indicator beams tend to remain steady. The directional antenna is then picking up only the desired signal and rejecting the reflected multipath signals. In some locations it is possible for the best reception to occur when picking up a strong reflected signal rather than the direct signal. Multipath distortion is practically independent of signal strength. [. . . ] It consists of two, three transistor amplifiers, one for each channel. The design uses considerable negative feedback to help achieve low distortion, wide frequency response, and excellent stability. Each audio 8 amplifier delivers 2. 5 volts to the FIXED OUTPUT jacks. A second pair of outputs are available where level can be varied by the VOLUME control. [. . . ]