User manual MCINTOSH MA6200

[. . . ] THE MA 6200 INTEGRATED AMPLIFIER Reading Time: 40 Minutes Price: $2. 00 VARIOUS REGULATORY AGENCIES REQUIRE THAT WE BRING THE FOLLOWING INFORMATION TO YOUR ATTENTION. PLEASE READ IT CAREFULLY. WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. The Mclntosh you have purchased is a Model MA 6200. Record that serial number here: Serial Number The model, serial number and purchase date are important to you for any future service. Record the purchase date here: Purchase Date Upon application, Mclntosh Laboratory provides a Three-Year Service Contract. [. . . ] turning the control to the left accents the left channel by reducing the right channel output. turning the control to the right accents the right channel by reducing the left channel output. The LOUDness control [small center knob] increases both bass and treble frequencies of both channels as it is turned clockwise. Adjustment of the LOUDness control allows life-like frequency balance when playing music softly. Its frequency response contour is accurately modeled after the family of "Equal Loudness" curves identified by Fletcher and Munson. The loudness circuitry is completely independent of the volume control. Therefore, any desired amount of compensation can be introduced regardless of volume control position. 9 Use the EQUALIZER FREQUENCY controls to modify the sound and tone balance of program material. Here are some suggestions from which to start: Problem Equalizer Correction Bass too weak Raise 30 and/or 150 Male vocalist needs reinforcing Raise 150 Female vocalist reinforcing Raise 500 Hum on program Reduce 30 Violins, trumpets dull Raise 1500 Drum "brushes" not audible Raise 10 K HEADPHONE JACKS The front panel HEADPHONE jacks have been designed to feed low impedance dynamic headphones. Electrostatic headphones generally require higher power than dynamic headphones. They must be connected to the speaker push connectors on the rear panel. Adjust the front panel VOLUME control for comfortable headphone listening. Signal to the headphone jacks is not affected by the SPEAKER switches. TAPE PUSHBUTTONS IMPORTANT: When the MA 6200 is operated with either MONITOR pushbutton at the in position, the program heard will be that from the tape recorders only. The MONITOR switches are mechanically interlocked to prevent simultaneous monitoring from two tape recorders. If one button is at the in position, it must be pushed again to release it to the out position before the other button can be pushed. The MA 6200 is designed so it may be used with two tape recorders. The four left pushbuttons control the signal output of these recorders. They permit recordings to be monitored as they are being recorded, or copying of tapes from one recorder to another while listening to a separate program or the playback of either recorder. MONITOR TAPE 1 pushbutton out: The program source as selected by the INPUT SELECTOR is fed to the power amplifiers and heard through the loudspeakers; pushbutton in: Signal from a tape recorder plugged into INPUTS TAPE 1 is fed to the power amplifiers and heard through the loudspeakers. It also controls the program from a tape recorder plugged into the front panel TAPE jacks. When a tape recorder is plugged into the front jacks the tape input circuit is transferred from the rear TAPE 2 IN jack to the front jack. The tape recorder plugged into the TAPE 2 IN jack on the rear panel is automatically disconnected. TAPE COPY T1 T2 pushbutton in: connects the output from tape recorder 1 to the input of tape recorder 2 without affecting the program being heard from the speakers. [. . . ] The MA 6200 power amplifier is all direct coupled to insure maximum low frequency performance. In most direct coupled circuits, failure of any transistor in the power amplifier will cause a DC potential to appear in the output. To assure that no damaging or interfering DC appears across the output terminals, a special, very fast acting protector circuit constantly monitors the output circuit for DC. If, at any time, a constant DC level appears, the speakers are disconnected. [. . . ]