User manual MCINTOSH C28

[. . . ] THE MCINTOSH C 28 SOLID STATE STEREO PREAMPLIFIER Reading Time: 37 Minutes Price $1. 25 Your MC 28 Stereo Preamplifier will give you many years of pleasant and satisfactory performance. If you have any questions, please contact: CONTENTS Service Contract. . 1 CUSTOMER SERVICE Mclntosh Laboratory Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-3512 Installation. . [. . . ] TAPE 2 pushbutton also controls the program from a tape recorder plugged into the front panel jacks marked TAPE INPUT and TAPE OUTPUT. When a tape recorder is plugged into the front panel jacks all the facilities for TAPE 2 are automatically switched to the front panel packs. A tape recorder plugged into the TAPE 2 INPUTS and OUTPUTS on the back panel is automatically disconnected. Use the front panel pushbutton TAPE 2 to record on or playback from a tape recorder plugged into the front panel jacks. TAPE COPY 1->2 TAPE COPY 2->1 This pushbutton, when pushed IN, connects the TAPE 2 OUTPUT jacks to the TAPE 1 INPUT jacks without affecting the program heard from the speakers. In this position a copy of the program on tape recorder 2 can be made on tape recorder 1. With the pushbutton in the IN position a rectangle is lighted in ORANGE above the pushbutton. To monitor the tape copy procedures use the TAPE 2 MONITOR pushbutton. LF (LOW FREQUENCY FILTER) Use the LF filter switch to reduce objectionable low-frequency noise created by a turntable or record changer or acoustically coupled feedback. low-frequency rumble and noise below 50 Hz are reduced when the switch is pushed to the IN position. With the LF pushbutton in the IN position a rectangle is lighted in GREEN above the pushbutton. When the GREEN light is on the low frequency filter is in operation. HF (HIGH FREQUENCY FILTER) Use the HF filter switch to reduce objectionable high-frequency noise such as record scratch. rolls OFF response sharply above 7000 Hz With the HF pushbutton in the IN position a rectangle is lighted in GREEN above the pushbutton. When the GREEN light is on the high frequency filter is in operation. SPEAKER PUSHBUTTONS Speakers can be turned on and off when properly connected with the accessory Mclntosh SCR control. 7) If the program is to be heard from the main speakers only, the REMOTE pushbutton is pushed IN. This turns off the remote speakers and lights a rectangle in BLUE above the pushbutton. The BLUE light indicates that the remote speakers are off and no program can be heard from them. If the program is to be heard from the remote speakers only the MAIN pushbutton is pushed IN. This turns off the main speakers and lights a rec- This pushbutton, when pushed IN, connects the TAPE 1 OUTPUT jacks to the TAPE 2 INPUT jacks without affecting the program being heard from the speakers. In this position a copy of the program on tape recorder 1 can be made on tape recorder 2. With the pushbutton IN a rectangle is lighted in ORANGE above the pushbutton. [. . . ] The resistive and capacative elements form a 12 dB per octave active RC filter. The high frequency filter is a 7000 Hz active, low pass, filter. The low frequency filter is a 50 Hz active, high pass, filter. The filter amplifier also forms a 20, 000 Hz active low pass filter to reduce noise outside the useful sound spectrum while leaving the preamplifier response flat to 20 000 Hz. [. . . ]