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THE McINTOSH MR 78 SOLID STATE FM/FM STEREO TUNER

Reading Time 32 Minutes

Price $1.25

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Summary of Contents for MR 78

Page 1: ...THE McINTOSH MR 78 SOLID STATE FM FM STEREO TUNER Reading Time 32 Minutes Price 1 25...

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Page 3: ...ree of any charge The SERVICE CON TRACT does not cover any shipping costs to and from the authorized service agency or the factory 2 Any Mclntosh authorized service agency will re pair all Mclntosh in...

Page 4: ...ind the panel With the template in place mark the six A and B holes and four small holes locating the corners of the cutout Next join the four corner marks with pencil lines the edge of the template m...

Page 5: ...nel At the bottom front corners of the instrument are the PANLOC buttons Depressing the PANLOC buttons will lock the instrument firmily in the cab inet Depressing the PANLOC buttons a second time as w...

Page 6: ...lied with the MR 78 An outdoor antenna is recommended for optimum performance in all areas In fringe outlying areas best results will be obtained with a highly directional FM antenna used in conjuncti...

Page 7: ...FM ANTENNA OPTIONAL 75 ANTENNA LEAD IN LEFT SPEAKER POWER AMPLIFIER PREAMPLIFIER RIGHT SPEAKER 5...

Page 8: ...the VOLUME control Turning the volume control fully counterclockwise turns the AC power off TUNING DIAL AND METER The MR 78 has two dial scales 1 FM scale marked 88 to 108 MHz 2 Logging scale marked...

Page 9: ...d steady SELECTIVITY SWITCH AND INDICATOR The SELECTIVITY switch allows stereo reception even under severe receiving conditions Setting the SELECTIVITY switch to NORMAL connects a very low distortion...

Page 10: ...ereo If a station is not transmitting the 19 000 Hz pilot for stereo the STEREO indicator will remain off and the tuner will automatically switch to mono When the MODE switch is set to STEREO ONLY mon...

Page 11: ...frequencies from 20 Hz to 15 000 Hz with peak modulation equal to 100 or less Typically 0 1 9 MAXIMUM SIGNAL INPUT 12 volts across 300 ohm antenna terminals will not increase harmonic or intermodulati...

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Page 14: ...ed at 104 3 MHz would not bother the signal at 96 3 MHz When tuned to 104 3 MHz the tuner will not overload All MR 78 tuners must pass the 12 volt overload test The MR 78 has an antenna matching circu...

Page 15: ...e mathematics for the design of the IF filter It would have taken an engineer working twen ty four hours a day seven days a week and working error free three hundred years to perform the same mathemat...

Page 16: ...nt It consists of two two transistor amp ifiers one for each channel The design uses consider able negative feedback to help achieve low distortion wide frequency response and excellent stability Each...

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Page 20: ...McINTOSH LABORATORY INC 2 CHAMBERS ST BINGHAMTON N Y 13903 607 723 3512 Design subject to change without notice Printed in U S A 038 580...

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