McIntosh MC-60 glass tube power stereo sound amplifier

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Tested both AMPS (07/09/09) See pictures of Actual Tests connected to a pair of RWO FOSTEX Speakers thru each of the 0.5V mono Input jacks. As expected, CLEAN CRISP quality sound reproduction. No hissings or unexplained background noise. Over all, our expectations were met. Clean, Crisp, Live music reproduced like being in the best seats of the house. This particular pair item of McIntosh MC-60 Glass Tube Power Amplifiers is a rare find. From it's exceptional appearance despite of it's age being around since the 50's this pair was obviously well kept. Minor scratches and erased numbers/ letters on chrome plating DESCRIPTION The Mclntosh Model MC-60 is a 60 watt high fidelity power amplifier designed for home entertainment systems and professional applications w high power and distortion free performance is required. The Model MC-60, like all other Mclntosh power amplifiers, uses the exclusive Mclntosh high efficiecny output circuit and bifilar output transformer to obtain the high standard of performance found in this amplifier. Some of the more important characteristics of the amplifier are; less than 0. 5% harmonic distortion at any power output up to 60 watts and at any frequency in the audio spectrum, 20 to 20, 000 cps; less than 0. 5% intermodulation distortion for all power levels up to 120 instantaneous peak watts; and noise and hum level 90 db or more below the rated output level. The MC-60 has two high impedance inputs and may be operated from any signal source delivering 0. 5 volts or more, or directly from a Mclntosh Audio Compensator or Pre-Amplifier. Output impedance of 4, 8 and 16 ohms are provided for direct connection to loudspeakers. Additional outputs for 83 ohms (70.7 volts) and 600 ohms are provided for use with multiple speaker systems, lines, etc. INSTALLATION Location: The MC-60 should be located in a well-ventilated area. If the amplifier is housed in a cabinet or other enclosure, holes must be provided for air circulation. Input Connections 1. When a Mclntosh Audio Compensator or Pre-Amplifier of the non-self powered type is used with the MC-60, plug the pre-amplifier's output-power cord into the "PRE - AMP INPUT" receptacle on the MC-60 and turn the "GAIN" control fully counter clockwise. This receptacle supplies the required plate and filament power to the pre-amplifier equipment as well as providing the necessary audio connections. For pre-amplifier installation, adjustment and operation refer to the pre-amplifier's instruction manual. 2. When using a self-powered Mclntosh Audio Compensator or Pre-Amplifier, connect the audio output from the pre-amplifier to the input of the MC-60 using the cable supplied with the pre-amplifier. Turn the "GAIN" control fully counter clockwise 3. When a signal source of 0. 5 volts or more is used to drive the MC-60, such as the output of a tuner, tape recorder, or other pre-amplifiers, plug the source into the"0. 5 VOLT" pin jack receptacle or connect to the "0, 5 VOLT" and "GND" screw terminals. 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 t erminal connector or the output socket. In addition, a 600 ohm output (balanced to ground) is available at the output socket. See schematic diagram for socket connections. It is important that the loudspeaker or other load be properly matched to 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 b... read more

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