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McIntosh MC-30 User's Manual
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1. Auxiliary Equipment connection Pre Amp input receptacle Size Weight Finish 117 125 volta 50 60 cycles 135 watts at 30 watts output 105 watts at zero signal output 30 watts continuous Input 1 pin jack and screw terminals and pin 5 ofpre ampsocket 5 volts to 30 volts with gain control Input 2 pin 2 of pre amp socket 2 5 volts For use with McIntosh pre ampli fier equipment 20 to 30 000 cycles 1 db at 30 watts output 15 to 50 000 cycles 5 db at 30 watts output 10 to 100 000 cycles 1 db at 15 watts output Less than 1 3 at 30 watts output orless 20 to 20 000 cycles Less than 1 2 if instantaneous peak power is below 60 watts for any combination of fre quencies 20 to 20 000 cycles Negligible 90 db or more below rated output 12 or better for 4 8 and 16 ohm output 16 for 600 ohms 0 5 meg for 0 5 volt input and 0 13 meg for 2 5 volt input 20 cycles to 40 Kc 4 8 16 166 70 7 volts and 600 ohms 600 ohm is balanced to ground 20 cycles 3 20 000 cycles 9 Pre Amp 12AX7 Phase Inverter 12AU7 Voltage Amp 12 BH7 Driver 12AX7 Output 2 6L6 GC 1614 Rectifier 5U4 GA Designed to power C 8 and other McIntosh Pre Amplifiers 13 x 8 x 8 high chassis type construction 30 5 pound net Chrome and Black
2. INSTRUCTION MANUAL McINTOSH MODEL MC 30 30 WATT POWER AMPLIFIER Type A 116B Serial 9E341 and above 038 243 MCINTOSH LABORATORY INC DESCRIPTION The McIntosh Model MC 30 is a 30 watt high fidelity power amplifier designed for home en tertainment systems and professional applications The Model MC 30 is similar to the earlier McIntosh Model A 116 30 watt amplifiers and includes all of the rigid electrical specifications and features found in these earlier units plus less than 1 3 harmonic distortion at any power output up to 30 watts and at any frequency in the audio spectrum 20 to 20 000 cps less than 1 2 intermodulation distortion if instantaneous peak power is below 60 watts for any combin ationof frequencies 20 to 20 cps and noise and hum level 90 db or more belowrated output The famous McIntosh high efficiency output circuit is used to obtain the high standard of per formance found in this amplifier The MC 30 maybe operated from any signal source delivering 5 or more volts or directly from a McIntosh Audio Compensator or Pre Amplifier such as the Models C 8 C 4 C 104 or C 108 Output impedances of 4 8 and 16 ohms are provided for direct connection to loud speakers Additional outputs for 166 ohms 70 7 volts and 600 ohms are provided for use with multiple speaker systems lines etc INSTALLATION Location The MC 30 should be located in a ventilated area If the amplifier is housed in a cabinet
3. or other enclosure holes should be provided for air circulation Input Connections 1 When a McIntosh Audio Compensator or other McIntosh pre amplifier is used with the MC 30 plug the pre amplifier s output power cord into the Pre Amp input receptacle on the MC 30 and turn the gain control fully counter clockwise This receptacle supplies the re quired plate and filament power to the pre amplifier equipment as well as providing the neces sary audio connection For pre amplifier installation and operation refer to pre amplifier s instruction manual 2 When a signal source of 0 5 volts or more is used to drive the amplifier such as the output from a tuner tape recorder or pre amplifier plug the source into the 0 5 volt input pin jack receptacle or connect to the 0 5 volt and GND screw terminals Use the gain control to obtain the desired operating level GUARANTEE We guarantee the performance of this equipment and the mechanical and electrical workman shipto be free of defects for a period of 90 days This guarantee does not extend to components iamaged by improper use nor does it extend to transportation to and from the factory SERVICE INFORMATION All McIntosh equipment is designed far long trouble free operation All components are of highest quality and are conservatively operated If trouble develops the amplifier may be ser viced by your franchised dealer a competent serviceman or returned to the facto
4. ry Equip ment will not be accepted at the factory unless factory return authorization is first received The following chart of operating voltages and resistances is offered as a guide for servicing the unit All voltages and resistences are measured to chassis except those with asterisk These are measured to chassis with pin 2 of the 5U4GB grounded Voltages are measured with high impedence VTVM NOTE UNIT MUST BE TURNED OFF WHEN MEASURING RE SISTENCES VOLTAGE AND RESISTANCE CHART DC Volts DC Volts AC Volts Resistance Tube Pin No NoSignal at 30W out at out Unit off 12AX7 Input 1 134 120 1 3 330K 2 0 0 0 24 1M 3 1 2 1 1 0 22 3 3K 4 amp 5 Fil 6 3 V ac to Pin 9 0 to 70 6 7 8 9 Fil 0 to 70 12AU7 1 270 235 9 40 2 134 120 13 330K 3 amp 8 138 126 0 57 13K 4 amp 5 Fil 6 3 V ac to Pin 9 0 to 70 6 270 235 9 43K 7 110 100 0 26M 9 Fil 0 to 70 12BH7 1 355 295 132 12 2 0 0 9 220 3 amp 8 16 14 0 32 1 2K 4 amp 5 Fil 6 3 V ac to Pin 9 0 to 70 6 355 295 132 12K 7 0 0 9 220 9 0 to 70 ELECTRICAL AND MECHANICAL SPECIFICATIONS Specifications for the McIntosh Model MC 30 Audio Amplifier Power Supply Power Consumption Power Output Input level Frequency Range Harmonic Distortion Intermodulation Distortion Impulse Distortion Noise and Hum Level Damping Factor Input Impedance Output Impedance Phase Shift Tube Complement
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