McIntosh C28 Owner's Manual
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McIntosh C28 Owner's Manual

Solid state stereo preamplifier
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OWNER'S MANUAL
Price $1.25

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  • Page 1 OWNER'S MANUAL Price $1.25...
  • Page 2 6. For your protection Mclntosh selects its dealers carefully- The require- ments are very strict. Only one dealer in seven applicants qualifies for a McIntosh franchise. To receive the SERVICE CONTRACT your pur- chase must be made from a Mclntosh franchised dealer.

  • Page 3: Table Of Contents

    CONTENTS Guarantee Installation If You're In A Hurry How To Connect Adjusting The Top Panel Controls ... 9 Using The Front Panel Controls 10, 11 Using The Pushbuttons 12, 13 Specifications 14, 15 Performance Charts 16, 17 Technical Description 18, 19 Block Diagram Your C 28 stereo preamplifier will give you many years of pleasant and...

  • Page 4: Installation

    Installation Adequate ventilation extends the trouble-free life of electronic Position the plastic mounting template over the area of the panel instruments. It is generally found that each 10" centigrade (18° F) to be cut out for installation. rise in temperature reduces the life of electrical insulation by one The design of the mounting template allows you to position or half.
  • Page 5 With the template in place against the cabinet panel, mark the "A" and " B " drill holes and the four small holes that identify the corners of the cutout. Join the corner marks with a pencil. The edge of the template can be used as a straight edge. IMPORTANT: DRILL THE 6 HOLES BEFORE MAKING THE CUT- OUT.

  • Page 6: If You're In A Hurry

    If You're In A Hurry quency noise such as record surface noise, A-BALANCE (outer ring) make H-PUSHBUTTONS OUT- flat response. one speaker louder than the other. Permits TAPE 1; Push in - Monitor the recorded L-MAIN (must be used with the accessory the adjustment for unequal sound caused program on TAPE recorder 1;...

  • Page 7: How To Connect

    How To Connect CONNECTING A RECORD PLAYER TO PHONO 1 Connect the cable from the "left" channel of the record player into the " L " PHONO 1 input jack. Connect the cable from the "right" channel of the record player into the "R"...
  • Page 8 How To Connect...
  • Page 9 How To Connect CONNECTING THE C 28 TO POWER AMPLIFIERS Connect the MAIN output jacks to the input of a stereo power amplifier. The " L " jack is connected to the "left" amplifier input jack. The "Ft" jack is connected to the "right" amplifier input jack.
  • Page 10 How To Connect...

  • Page 11: Adjusting The Top Panel Controls

    Adjusting The Top Panel Controls You will enjoy the best in stereo performance more when the room in which they are used. They are variable controls that pro- stereo system is properly balanced. For proper balance each chan- vide up to 6 dB of boost below 100 Hz. With the control in the nel must be equal in loudness and similar in frequency response.

  • Page 12: Using The Front Panel Controls

    Using The Front Panel Controls In the upper left of the front panel is a concentric control. The Tuner: Connects the output from any AM, FM or MPX FM tuner large outer knob is the BALANCE control. The small center knob to the high level input stage.
  • Page 13 VOLUME ON/OFF: TREBLE: Turning the VOLUME totally counter-clockwise turns the C 28 Left: Adjusts the treble loudness from the left loudspeaker. OFF. The VOLUME control regulates the loudness in both chan- Clockwise rotation increases the treble loudness while counter- nels. The VOLUME control has been precision tracked through- clockwise rotation decreases the treble loudness.

  • Page 14: Using The Pushbuttons

    Using The Pushbuttons The C 28 is designed to be used with one, two or three tape To monitor the tape copy procedures use the TAPE 1 MONITOR recorders, for example — tape playback from a tape deck (one with- pushbutton.
  • Page 15 To turn the power amplifiers off use the switch on the top panel the facilities for TAPE 2 are automatically switched to the front of the C28 marked POWER AMPLIFIER. This switch controls the panel jacks. A tape recorder plugged into the TAPE 2 INPUTS and AC to the green POWER AMP receptacles on the back panel.

  • Page 16: Specifications

    Specifications Microphone FREQUENCY RESPONSE: to Main Output 60 dB +0, -0.5 dB 20 Hz to 20,000 Hz. to Tape Output 40dB DISTORTION to Headphone/Line Output 57.5 dB Less than 0.1% at rated output level, 20 Hz Tape Head at 500 Hz to 20,000 Hz.
  • Page 17 by depressing the PANLOC buttons and sliding the C 28 for- channel only to both speakers, Stereo Reverse, Stereo, Mono, ward from the mounting panel. L + R to left speaker only, and L + R to right speaker only. LOW FREQUENCY TRIM CONTROLS TAPE MONITOR SWITCHES: Permits the increase in output of frequencies below 100 Hz...

  • Page 20: Technical Description

    Technical Description Basically, each channel of your C 28 consists of four main parts: low level amplifier, high level amplifier, active filters and headphone amplifier. Common regulated power supplies furnish power to both channels. LOW LEVEL AMPLIFIER Each channel of the low level amplifier is a four transistor dif- ferential amplifier input circuit.
  • Page 21 amplifier consists of 3 transistors selected for low noise character- than 0.2 ohms. Long shielded cables can be used without adversely istics. In the feedback loop, two 11 position switches allow up to affecting the frequency response. The headphone level controls 20 dB of boost or cut at 20 Hz and up to 18 dB of boost or cut at adjust the output level and balance of the headphone amplifier.

  • Page 22: Block Diagram

    Block Diagram...
  • 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. BE122003 038-343...

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