User manual MCINTOSH MC60

[. . . ] 5 % instantaneous peak power is below 120 watts Negligible 90 db or more below rated output 12 or better for 4, 8, and 16 ohm output, 16 for 600 ohms 0. 5 volt input, 20 cycles to 40 KC 4, 8, 16, 83 (70. 7 volts) and 600 ohms (600 ohm is balanced to ground) ±8° 20-20. 000 cycles Rectifier: Pre-Amp: Phase Inverter: Voltage Amp: Driver: Output: 2-5U4GB 12AX7 12AU7 12BH7 12AX7 2 KT-88/6550 Frequency Range Harmonic Distortion Intermodulation Distortion Impulse Distortion Noise and Hum Level Damping Factor Input Impedance Output Impedance Phase Shift Tube Complement Auxiliary Equipment Connection Size Weight Finish Designed to power C-4, C-8 and other Mclntosh pre-amplifiers 14" x 10" x 8" high, chassis type construction 46 pounds net Chrome and Black DESCRIPTION The Mclntosh Model MC-60 is a 60 watt high fidelity power amplifier designed f o r home entertainment systems and professional applications where high power and distortion free performance is required. [. . . ] Use the "GAIN" control to obtain the desired operating level. If desired, the signal source may be wired to an octal plug for insertion in the octal "Pre-Amp Input" receptacle. In this case connect the input lead to pin #5 and the ground lead to pin #1. When using this connection the source must not have a DC output component. Output Connections The MC-60 has output impedances of 4, 8 and 16 ohms available at either the screw terminal connector or the output socket. In addition, a 600 ohm output (balanced to ground) is available at the output socket. It is important that the loudspeaker or other load be properly matched to the amplifier if best performance is to be obtained. Because many loudspeakers do not have voice coil impedances exactly matching 4, 8 and 16 ohms, the following table lists suggested connections for the best impedance matching. 5 to 13 ohms 8 ohms 13 to 32 ohms 16 ohms WARNING: Output plugs wired for Mclntosh 20W-2 and 50W-2 amplifiers must not be used with the MC-60 without rewiring the plug. Power Connections The MC-60 operates from any 110 to 130 volt 50-60 cycles power line. (When continuous use is contemplated on 120 to 130 line volts the transformer primary should bo re-connected using the 125 volt tap. ) When the MC-60 is used with Mclntosh Pre-Amplifier equipment, tuners, or other associated equipment, the MC-60 power cord may be plugged into the receptacle at the rear of these units. When thus connected the power switch of these units controls the MC-60. [. . . ] Y. , U. S. A. In Canada: Manufactured Under License by McCurdy Radio Industries, Ltd. 22 Front Street West, Toronto, Canada OUTPUT CONNECTIONS USING OCTAL SOCKET 4 ohms - pins 1 & 2 8 ohms - pins 1 & 3 16 ohms - pins 1 & 4 500/600 ohms - pins 7 & 8 (pin 6 is CT and ground) 70. 7 volts - pins 5 & 6 (pin 6 is ground) PRE-AMPLIFIER INPUT SOCKET CONNECTIONS Pin 1 - Ground Pin 2 - Pre-Amp Input (2. 5V) Pin 3 - Not used Pin 4 - +360V at 3. 5 mA Pin 5 - Pre-Amp input (0. 5V) Pin 6 - not used Pins 7 & 8 - 6. 3V at 1 Amp R1 250K POT (GAIN A D J . [. . . ]