User manual MCINTOSH MC75

[. . . ] Do not expose batteries to excessive heat such as sunshine, fire or the like. Connect mains power supply cord only to a mains socket outlet with a protective earthing connection. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. 1. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. [. . . ] 14 Packing Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Technical Assistance If at any time you have questions about your McIntosh product, contact your McIntosh Dealer who is familiar with your McIntosh equipment and any other brands that may be part of your system. If you or your Dealer wish additional help concerning a suspected problem, you can receive technical assistance for all McIntosh products at: McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-1545 Fax: 607-724-0549 6 5. Batteries should never be thrown away or incinerated but disposed of in accordance with the local regulations concerning battery disposal. For additional information on the MC75 and other McIntosh Products please visit the McIntosh Web Site at www. mcintoshlabs. com. Note: The impedance of a Loudspeaker actually varies as the Loudspeaker reproduces different frequencies. As a result, the nominal impedance rating of the Loudspeaker (usually measured at a midrange frequency) might not always agree with the impedance of the Loudspeaker at low frequencies where the greatest amount of power is required. Contact the Loudspeaker Manufacturer for additional information about the actual impedance of the Loudspeaker before connecting it to the McIntosh MC75. Copyright 2009 © by McIntosh Laboratory, Inc. General Information, Cable Information, Introduction and Performance Features Connector and Cable Information Performance Features · Power Output The MC75 is a Tube Power Amplifier with a capability of 75 watts into 2, 4 or 8 ohm speakers with less than 0. 5% distortion. · Unity Coupled Circuitry The MC75 Power Amplifier uses the famous McIntosh Patented Unity Coupled Circuit which provides low distortion, extended frequency response and cool operating output tubes. · Multifilar Wound Output Transformer The MC75 Output Transformer Windings are part of the Unity Coupled Circuitry. There are two bifilar wound primaries, one for the cathodes and one for the plates. · Balanced and Unbalanced Input Balanced connections guard against induced noise and allow long cable runs without compromising sound quality. · Sentry Monitor Tube Protection McIntosh Sentry Monitor Tube Protection Circuits ensure the MC75 will have a long and trouble free operating life. · Gold Plated Connectors and Tube Socket Contacts Gold Plated Input Jacks and Output Binding Posts provide trouble free connections. Ceramic tube sockets with gold plated contacts provide protection from atmospheric contamination. · Special Power Supply A regulated Power Supply, a very large core Power Transformer and large capacitors ensure stable noise free operation even though the power line varies. · Titanium Chassis with Super Mirror Finish The famous McIntosh Stainless Steel Chassis with Super Mirror Gold Finish ensure the pristine beauty of the MC75 will be retained for many years. XLR Connectors Below is the Pin configuration for the XLR Balanced Input, Input/Output Connectors on the MC75. Refer to the diagram for connection: INPUT IN/OUT PIN 1: Shield/Ground PIN 2: + Output PIN 3: - Output PIN 2 PIN 1 PIN 3 PIN 1 PIN 3 PIN 2 Power Control Connector The MC75 Power Control Input receives an On/Off signal from +5 to +12 volts. For all other connections use only as an Output. 9 This Balanced connector may be used as an Input ONLY when connected to a McIntosh C1000 Preamplifier. For all other connections use only as an Output. How to Connect Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC75 Tube Power Amplifier until after the Loudspeaker Connections have been made. For additional instruction on making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical Support. For Remote Power Control, connect a power control cable from the Control Center or Preamplifier Power Control Out to the MC75 POWER CONTROL IN. [. . . ] While listening to a recording with a wide dynamic range, adjust the volume control on the Preamplifier or A/V Control Center so during the loud passages of the recording of the approximate rotational position of the Preamplifier or A/V Control Center Volume Control 13 Specifications Specifications Power Output Minimum sine wave continuous average power output is: 75 watts into 2 ohm load 75 watts into 4 ohm load 75 watts into 8 ohm load Output Load Impedance 2, 4 or 8 ohms Rated Power Band 20Hz to 20, 000Hz Total Harmonic Distortion 0. 5% maximum harmonic distortion at any power level from 250 milliwatts to rated power, 20Hz to 20, 000Hz Frequency Response +0, -0. 5dB from 20Hz to 20, 000Hz +0, -3. 0dB from 10Hz to 100, 000Hz Input Sensitivity (for rated output) 1. 7 Volt or 0. 85 Volt Unbalanced 3. 4 Volt or 1. 7 Volt Balanced Signal To Noise Ratio (A-Weighted) 110dB below rated output Intermodulation Distortion 0. 5% maximum, if the instantaneous peak power output does not exceed twice the rated power output for any combination of frequencies from 20Hz to 20, 000Hz. Wide Band Damping Factor Greater than 18 Input Impedance 20, 000 ohms Unbalanced 15, 000 ohms Balanced Tube Compliment 1 - 12AX7A Input and Phase Inverter 2 - 12AT7 Voltage Amplifier and Driver 2 - KT88 Power Output Power Requirements 100V ~ 50/60Hz at 2. 2 Amps 110V ~ 50/60Hz at 1. 8 Amps 120V ~ 50/60Hz at 1. 8 Amps 220V ~ 50/60Hz at 1. 0 Amps 230V ~ 50/60Hz at 0. 9 Amps 240V ~ 50/60Hz at 0. 9 Amps Standby: 0. 5 watt Weight 38 pounds (17. 24 kg) net, 43. 5 pounds (19. 73 kg) in shipping carton Shipping Carton Dimensions Width is 21 inches (53. 34cm) Depth is 13-1/2 inches (34. 29cm) Height is 15-1/8 inches (38. 42 cm) Note: Refer to the right side panel of the MC75 for the correct voltage. Overall Dimensions Width is 17-3/4 inches (45. 09cm) including Cables Height is 8-1/2 inches (21. 59cm) including feet Depth is 8-1/2 inches (21. 59cm) 14 Packing Instructions Packing Instructions In the event it is necessary to repack the equipment for shipment, the equipment must be packed exactly as shown below. It is very important that the four feet are attached to the bottom of the equipment. This will ensure the proper equipment location on the bottom foam pad. [. . . ]