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Summary of Contents for McIntosh MR-55A
- Page 1 INSTRUCTION MANUAL MclNTOSH MODEL MR-55A AM-FM TUNER (Serial No. 3K001 and up) McINTOSH LABORATORY, INC. 2 Chambers St. Binghamton, N. Y. U.S.A.
- Page 2 SPECIFICATIONS: Usable Sensitivity: Sensitivity: 3 Microvolts at 100% modulation (± 75 K.C. 1.5 microvolts Dev.) for less than 3% total noise and distortion I.H.F.M. standards. Selectivity: Capture Ratio: Narrow (4 K.C. bandwidth) ± 10 K.C. from center down 53 D.B. 1 to 0.8 Medium (13 K.C.
- Page 3 McIntosh product. The MR-55A may be mounted in its own cabinet or shelf mounted in a custom cabinet. The tuner has been designed to mount on a shelf rather than hang from the cast tuner panel. Rubber shock mounting feet have been provided to offer the optimum in mechanical isolation from extraneous vibrations.
- Page 4 FIG 1! In the parts bag are six 6/32 x 1 1/4 inches threaded rods. Install these in the six drilled and tapped holes in the back of the tuner panel. (See Fig. 2.) FIG 2 The tuner panel is now ready to be attached to the cabinet. The six threaded-rods are inserted through the two 5/32 inch and the four 3/16 inch holes in the cabinet panel.
- Page 5 FIG 3 FIG 4 A substitute for the folded dipole can be an existing VHF T. V. antenna. The MR-55A is supplied with an internal switching arrangement that eliminates the need for two set couplers. The VHF T. V. antenna lead-in is connected to the antenna terminals marked "FM ANT."...
- Page 6 An outside AM antenna is a wire as long as practical, mounted as high as possible above the ground, at right angles to power lines. The lead in should be carefully positioned away from all A. C, lines. The "ANTENNA" terminating switch must be in "ANT" position when using the outside or long wire antenna.
- Page 7 Multiplex Output The output on the back of the MR-55A marked "MULTIPLEX OUTPUT" is an unfiltered output for feeding a multiplex adapter. OPERATION Input Selector The input selector has six positions identified as (1) PHONO, (2) A. M. SHARP, (3) A. M. MED, (4) A.
- Page 8 F. M. Listen The ultrasonic muting circuit is defeated and A.F. C. added for greatest listening pleasure. McIntosh A. F. C. does not change in any respect the low distortion characteristics of the MR-55A. Volume The volume control has at its extreme counter-clockwise rotation the A. C. on-off switch. The switch also controls the A.
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