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  5. Owner's Manual

Macintosh MAC 1900 Owner's Manual

Manual is about: Solid state AM Fm Stereo receiver

Summary of MAC 1900

  • Page 1

    The mac 1900 solid state am fm/fm stereo receiver price $1.25.

  • Page 3: Contents

    Your mac 1900 am-fm/fm stereo receiver will give you many years of pleasant and satisfactory performance. If you have any questions concerning the operation or maintenance of this receiver please contact: customer service mcintosh audio division 2 chambers street binghamton, new york 13903 our telep...

  • Page 4

    Adequate ventilation extends the trouble-free life of electronic instruments. It is generally found that each 10° centigrade (18° f) rise in temperature re- duces the life of electrical insulation by one half. Adequate ventilation is an inexpensive and effective means of preventing insulation breakd...

  • Page 5: How To Connect

    How to connect 1. Connecting tape recorders to record: connect a cable from the l tape out 1 jack to the left high level input of a tape recorder. Connect a cable from the r tape out 1 jack to the right high level input of the tape recorder. Connect a second tape recorder in the same way to the l an...

  • Page 6

    2. Connecting record players connecting a 75 ohm antenna the mac 1900 has been shipped with shorting plugs in the phono inputs. Remove the shorting plugs only from the jack that will be used. Connect a cable from the "left" channel of a record player into the " l " phono 1 input jack. Connect a cabl...

  • Page 7: Antenna And Ground

    Connecting - record players maximum performance indicator antenna and ground fm antenna fm antenna input ground to water pipe or rod in earth to record changer or turntable maximum performance indicator turntable record changer optional 75 300 5.

  • Page 8: Connecting Loudspeakers

    Connecting loudspeakers: the mac 1900 power amplifier is designed for stereo connection only. Do not connect the mac 1900 for monophonic (one loudspeaker) operation. Damage to the loudspeaker or the power amplifier may result. Both main and remote speakers are connected to the push connectors on the...

  • Page 9: Connecting

    Connecting mcintosh loudspeakers with the environmental equalizer mq101 environmental equalizer right speaker left speaker 7 remote 1 left speaker remote 1 right speaker remote 2 left speaker remote 2 right speaker.

  • Page 10

    What the controls do and how to use them volume on/off: the volume control regulates the loudness in both channels. The volume control has been pre- cision tracked throughout the listening range {0 to —65 db) for accurate stereo balance. When rotated to the counterclockwise position the ac power to ...

  • Page 11: Using The Tuning Dial

    Using the tuning dial tuning dial the mac 1900 has three dial scales: 1. Am - marked 55 to 160 khz 2. Fm-marked 88 to 108 mhz 3. Logging scale - marked 0 to 100 the logging scale can be used to accurately re- tune any station. You may find it easier to keep a record of your favorite stations by use ...

  • Page 12

    The tape monitor switches are mechanically interlocked to prevent simultaneous monitoring from two tape recorders. If one button is at the in position, it must be pushed again to release it to the out posi- tion before the other button can be pushed. Important: when the mac 1900 is operated with eit...

  • Page 13: Balancing Your Stereo

    Justed to optimum at the factory using precision test instruments. Out . . . Muting disconnected. In . . . Between station noise suppressed on fm. Speaker when the speakers have been connected to the proper push connectors on the back panel, the push- buttons turn the speakers on or off. If the prog...

  • Page 14: Performance Limits

    Continues as usual. When the switch is in the out position normal program from the source is heard. How to copy tape 1. Put the tape to be copied on the recorder con- nected to tape 1 input. 2. Turn the input selector to tape 1. 3. The signal available at the tape output jacks is the playback of tap...

  • Page 15

    Harmonic distortion: does not exceed 1% at 30% modulation frequency response: 3500 hz at —6 db down adjacent channel selectivity: 30 db mini- mum ihf image rejection: 65 db minimum, 540 khz -1600 khz fm tuner section useable sensitivity: 2.5 microvolts at 100% modulation (±75 khz deviation) for 3% t...

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    14.

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    15.

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    16.

  • Page 19: Technical Description

    Technical description audio section each channel of the mac 1900 has four basic sections. They are: phono or low level amplifier, tape or high level amplifier, filter amplifier, and power amplifier. Phono amplifier there are three transistors in each channel of the phono amplifier. The input transis...

  • Page 20

    The rear of the mac 1900 connect the filter amplifier output (preamp out) and power amplifier input (amp input). At the input of the power amplifier, two transistors are connected as a differential amplifier. The two in- put signals to the differential amplifier are the input signal (output of the f...

  • Page 21

    Plifier. Each gate of the transistor is internally pro- tected by zener diodes against incoming transients that may occur due to external conditions. Use of the mos-fet greatly enhances the cross modulation performance over a wider dynamic range. A wider dynamic range permits the input circuit to ac...

  • Page 22

    Ceived, the automatic fm stereo switching circuit activates the multiplex decoding circuit. This lights the stereo indicator. The circuit switching is all done electronically with no clicks. The automatic stereo switching can be defeated by depressing the mono pushbutton. (in this position the stere...

  • Page 23: Block Diagram

    Block diagram 21.

  • Page 24

    Mcintosh laboratory inc. 2 chambers st., binghamton, n. Y. 13903 607-723-3512 design subject to change without notice. Printed in u.S.A. 038-674 be122003.