User manual MCINTOSH C22

[. . . ] STEREO PREAMPLIFIER C22 1 1 2 2 3 8 8 8 9 9 10 11 11 11 16 16 GENERAL DESCRIPTION TECHNICAL DESCRIPTION Mechanical Specifications Electrical Specifications FRONT PANEL INFORMATION INSTALLATION CONNECTIONS AC Connections AC Power Input Connections Output Connections Loudspeaker Phasing Connections Ground Connection OPERATING INSTRUCTIONS GUARANTEE 3-YEAR FACTORY SERVICE CONTRACT CONTENTS OWNER'S MANUAL C 22 C22 STEREO PREAMPLIFIER GENERAL DESCRIPTION The Mclntosh C22 Stereophonic Preamplifier is a control center for any stereophonic sound system. To increase your enjoyment of stereo, this control center does four jobs with precise control. First, the control center amplifies weak electrical impulses. As the record rotates on the turntable, undulations in the grooves move the pickup stylus approximately one thousandth of an inch, in any direction, from the rest position. [. . . ] The following chart may be used as a guide: Resistor Across Input No Resistor 180, 000 ohms (180K) 62, 000 ohms (62K) 22, 000 ohms (22K) 8, 200 ohms (8. 2K) 9 Figure 16. Turntables feeding low-level inputs. OUTPUT CONNECTIONS There are two sets of outputs on the left half of the back panel. (See Figure 15) One pair is marked M A I N . The M A I N outputs connect to power amplifiers (figure 17). The MAIN jacks are fed from cathode followers. Longer cables than are normally supplied can be connected between the C22 and the amplifiers. The length of the cable is limited by the capacity of the cable. The total capacity must not exceed 1000 mmf. For instance: cables with a capacity of 25 mmf per foot may be 40 feet long; 13. 5 mmf per foot cable may be 75 feet long. The input impedance of the amplifiers should be 50, 000 ohms or greater. The TAPE output is fed from a cathode follower. The program material fed out of the TAPE output is not affected by these front panel controls: VOLUME control, BASS controls, LF and HF filter switches, BALANCE control, LOUD switch, TAPE switch, PHASE switch, TREBLE controls, and MODE SELECTOR switch. The program material fed out of the TAPE output is affected by these front panel con- Figure 17. MAIN OUTPUT Connected to Power Amplifiers. 10 trols: I N P U T SELECTOR positions, AUX, TAPE, TUNER 1, T U N E R 2, or MIC, the MUTING switch and T U N I N G control. When the INPUT SELECTOR is turned to TAPE HD then the COMP should be set to R I A A . The input impedance of the tape recorder should be 50, 000 ohms or greater. A jack marked L + R OUTPUT is located next to M A I N OUTPUTS. A monophonic signal can be distributed to other rooms by connecting another power amplifier to the jack marked L + R. The cable connecting this output to the amplifier should not have a capacity of more than 1000 mmf. The i n p u t impedance of the power amplifier connecting to this output should not be less than 150. 000 ohms (150K). LOUDSPEAKER PHASING CONNECTIONS Two pairs of screw terminals are located on the lower left section of the C22 back panel. The speaker leads from the "left" power amplifier should be connected to the screw terminals marked FROM A M P L I F I E R . The pair of terminals marked TO SPEAKER should be connected to the "left" loudspeaker. [. . . ] The left jack supplies the left channel. The right jack supplies the right channel. Turn the I N P U T SELECTOR switch to TAPE. When the TAPE JACK control is turned to the PLAYBACK position, the permanent tape machine output is discon- 14 the other the only control that is effective is the TAPE JACK switch. [. . . ]