McIntosh MC 30 Owners Manual
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Extracted text from McIntosh MC 30 Owners Manual (Ocr-read)
Page 1
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- ation of frequencies 20 to 20, 000 cps; and noise and hum level 90 db or more below rated 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 0. 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 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 the 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.
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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 factory. 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 Tube 12AX7 (Input) 12AU7 12BH7 Pin No. 1 2 3 4&5 6, 7, 8 9 1 2 3&8 4&5 6 7 9 1 2 3&8 4&5 6 7 9 DC Volts No Signal 134 0 1.2 Fil - Fil 270 134 138 Fil 270 110 Fil 355 0 16 Fil 355 0 Fil DC Volts at 30W out 120 0 1. 1 6. 3 V. ac to Pin 9 - - 235 120 126 6. 3 V. ac to Pin 9 235 100 - 295 0 14 6. 3 V. ac to Pin 9 295 0 - AC Volts at 30W out 1. 3 0. 24 0. 22 - - - 9 13 0. 57 - 9 0 - 132 9 0. 32 132 9 - Resistance Unit off 330K* 1M 3.3K 0 to 70 - 0 to 70 40* 330K* 13K 0 to 70 43K* 26M* 0 to 70 12K* 220K 1.2K 0 to 70 12K* 220K 0 to 70