McIntosh C8 - SCHEMATICS Owner'S Manual Download Page 1

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McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www.mcintoshlabs.com

Tube Preamplifier

Owner’s Manual

Summary of Contents for C8 - SCHEMATICS

Page 1: ...McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 www mcintoshlabs com C8 Tube Preamplifier Owner s Manual ...

Page 2: ...Street Binghamton New York 13903 Technical Assistance 607 723 3512 Customer Service 607 723 3515 Fax 607 724 0549 Email support mcintoshlabs com Website mcintoshlabs com Copyright 2020 by McIntosh Laboratory Inc The C8 Tube Preamplifier marries McIntosh s long tradition of uncompromising quality and leadership in Vacuum Tube amplification with the latest cutting edge innovations to bring you an un...

Page 3: ...te 2 Safety First 2 Remove the Foam 4 Where to put it 6 The Front Panel 7 The Left Knob 7 The Right Knob 7 Connections on the Back 8 The Inputs 8 The Outputs 8 Making Connections 8 Phono Unbalanced Inputs 8 Balanced XLR Input and Output 9 RS232 9 Wired IR Input 9 Connection Diagram 10 DA2 Expansion Slot 11 Power Control Trigger Outputs 11 Data Out 11 Power On the C8 12 Trim Functions and Settings ...

Page 4: ... Orient the C8 so the Front and Top of the Preamplifier is facing you Refer to Figure A 3 Carefully lift upright the Foam Insert Vacuum Tube Cover and place it near to the C8 Preamplifier Refer to Figure C TO AVOID A FIRE HAZARD THE FOAM INSERT OVER THE VACUUM TUBES MUST BE REMOVED PRIOR TO CONNECTING THE AC POWER CORD AND OPERATING THIS PRODUCT WARNING REFER TO THE OWNER S MANUAL FOR INSTRUCTIONS...

Page 5: ...vers must be installed over each of the four Small Vacuum Tubes before the C8 Preamplifier is connected to AC Power and activated for use Failure to do so has the potential to cause physical harm to human beings and animals This could also result in damage to the Vacuum Tubes and the C8 Internal Circuitry It also prevents the potential of a Fire Hazard resulting in damage to the C8 and the surroun...

Page 6: ...5 1cm on each side of the C8 so that airflow is not obstructed 18 inches 45 7cm depth behind the front panel 1 7 16 inch 3 7cm in front of the mounting panel for knob clearance 1 5 16 1 32 1 32 11 7 8 30 2cm Rear View of the C8 11 1 2 29 2cm 12 30 6cm 7 5 8 19 4cm 7 1 32 17 9cm 7 17 9cm 7 1 32 17 9cm 3 36cm 12 3 4 32 4cm 3 3cm Side View of the C8 15 3 8 VOLUME INPUT HEADPHONES PUSH TRIM PUSH POWER...

Page 7: ...ight Knob The Right Knob labeled VOLUME is used to change the volume as well scroll through input values within Trim Mode Push and release the knob to Power Off Push the Right Knob to Power On when the C8 is off Turn clockwise or counterclockwise to scroll through input values in Setup mode or Trim Mode Push and release to Power On when C8 is Off Push and release to Power Off The Standby Indicator...

Page 8: ...or Z The Outputs One Pair unbalanced RCA Output 1 G One pair balanced XLR audio Output 1 H One pair unbalanced RCA SUB Output 2 F Two 1 8 inch Data Output jack J Three 1 8 inch jack Power Control trigger Outputs M O P Making Connections Phono Unbalanced Inputs Unbalanced Inputs such as the two PHONO INPUTS and UNBALANCED INPUTS 1 and 2 use RCA phono cables to connect the C8 to other components See...

Page 9: ...e diagrams for connections PIN 1 Shield Ground PIN 2 Signal PIN 3 Signal RS232 The RS232 jack is used to connect the C8 to automation controller devices with RS232 connectors To utilize this feature you will need an appropriate RS232 Data Cable The RS232 Data Cable should be an 1 8 inch 3 5mm stereo mini phone plug to a subminiature DB9 connector RS232 DB9 Connector Pin Layout 1 N C no connection ...

Page 10: ...Input Connect to a Data Port In on a source Connection Diagram There are many possible connections for the C8 depending on your system This diagram shows a few typical ones IN OUT McINTOSH LABORATORY INC BINGHAMTON NY HANDCRAFTED IN USA WITH US AND IMPORTED PARTS T5AL 250V 120V 50 60Hz 3 7A DIS ENA UNBAL BAL INPUT MODE AUTO OFF PWR CONTROL BALANCED IN OUTPUT CLASS 2 WIRING UNBALANCED IN FUSE PUSH ...

Page 11: ...l Meter Illumination Control Ground Passthru The C8 s PASSTHRU feature allows your 2 channel system to be incorporated into a multichannel system typically as the left and right front speakers When the connected unit Master powers on it will take control of your C8 The C8 will send the signal to your amplifier and speakers at a volume controlled by the Master The C8 preamplifier is now a slave to ...

Page 12: ... Auto Off Brightness adjustments 25 50 75 or 100 To use the Trim Menu you can either Press and release the Left Knob to enter the Trim Menu Turn the Left Knob to scroll the Trim Functions Turn the Right Knob to change settings for the current Trim Function Press and release the Left Knob or allow the screen to time out to exit the Trim Menu or turn the Left Knob to access a different Trim Function...

Page 13: ...nu see Figure 12 Rotate the Left Knob to view the Inputs Balanced Unbal 1 Unbal 2 MM Phono MC Phono If DA2 Expansion see DA2 Expansion Slot on page 11 has been added additional Inputs will appear The selected input can be turned On default or Off by turning the Right Knob If On is selected the Input can be renamed To rename the selected input press and hold the Left knob until the RENAME screen ap...

Page 14: ...ices are Balanced Unbal 1 and Unbal 2 Digital inputs if added and Phone inputs are not available as input choices for Passthru Typically you should choose the input that the Master is connected to Now when the source unit is powered on a signal will be sent to your preamplifier and the connected input will play That input will not be available to play outside of the master slave relationship unles...

Page 15: ...eature Turn Knob to the menu choice SETUP Auto Off Turn the Right Knob clockwise for Enabled on or counterclockwise Disable off Press and release the Left Knob to exit the Setup menu FACTORY RESET Use the FACTORY RESET option if you wish to return all settings to factory defaults All changes made will be lost such as renamed Inputs or Trigger assignments Turn Knob to the menu choice SETUP FACTORY ...

Page 16: ...nal Push buttons Up Down Left and Right LED illuminates during the time a remote command is sent to the C8 Increases the volume level Decreases the volume level Mutes and unmutes the audio Powers the C8 ON or OFF Select the desired active TRIM function also manually tune down the dial with contemporary McIntosh Tuners Selects Previous Track during CD Playback Selects Next Track during CD Playback ...

Page 17: ...and then lift it off There are many ways do to this as far as positioning your fingers To open the remote Hold the remote upsidedown and backwards with McIntosh name upsidedown and facing away from you The thicker end will now be the top and you should be staring at the back of the remote Pinch the remote with your index finger resting on the SELECT TRIM button and your thumb on the backside facin...

Page 18: ...ays It is very important that the four plastic feet are properly placed in the holes of the Foam Bottom Pad This will ensure the proper equipment location for shipping Failure to do this will result in shipping damage Quantity Part Number Description 1 034661 Shipping Carton 1 034654 Foam Pad Bottom 1 034658 Foam Top Cover 1 033656 Foam Ring 1 033657 Foam Upper Ring 1 034579 Foam Tube Cage 1 03465...

Page 19: ...gh Level 5V Unbalanced 10V Balanced Phono MM 80mV Phono MC 8mV Voltage Gain High Level to Output 1 or 2 15dB Phono MM to Output 1 or 2 55dB Phono MC to Output 1 or 2 75dB Power Control and Trigger Output 12VDC 25mA Power Requirements Field AC Voltage conversion of the C8 is not possible The C8 is factory conFigured for one of the following AC Voltages 100 Volts 50 60Hz at 50 watts 110 Volts 50 60H...

Page 20: ...The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice Printed in the U S A McIntosh Part No 24109701 ...

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