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A. F. C.
The A. F. C. is completely variable from off at the counter-clockwise position of the control to full on at
the extreme clockwise end of its rotation. In areas where weak stations are near strong stations on the dial
only enough A. F. C. need be used to hold the weak station. No change in audio quality will be detected
over the complete rotation of the A. F. C. control.
Dial
In addition to the regular A. M. and F. M. identification on the dial a logging scale has been supplied
to facilitate repeat tuning of familiar stations.
All Mclntosh equipment is designed for long trouble free operation. All components are of highest qual-
ity and are conservatively operated. If trouble develops the equipment may be serviced by your franchised
dealer, a competent serviceman, or returned to the factory. Equipment will not be accepted at the factory
unless factory return authorization is first received.
Complete step by step alignment procedures are outlined in this manual. The MR-55 is a professional de-
vice dependent for its superior performance on critical and proper adjustment. Adjustments should be made
only by thoroughly qualified personnel, and with the proper equipment. The minimum recommended equip-
ments are as follows:
1. Low distortion FM-AM Sweep generator, such as Boonton 202E.
2. Low distortion AM Signal generator such as Measurements 65B.
3. Univerter such as Boonton 207E.
4. Distortion analyzer such as Hewlett Packard 330B.
5. Oscilloscope such as Dumont 274A.
6. Vacuum tube Voltmeter such as R. C. A. WV-98A.
Much research has been done in our laboratory to overcome the need for alignment and adjustment en-
countered in high quality tuners. Design parameters have been selected so that major changes can occur in
components without degrading the high quality results. Tube replacements seldom require re-alignment. Trans-
formers have been made mechanically captive to prevent misalignment due to vibration and shock. There-
fore, the need for adjustment and alignment has been substantially reduced. Mclntosh Laboratory, of course,
will align and adjust any tuner upon request.
We guarantee the performance of this equipment and the mechanical and electrical workmanship to be
free of serious defects for a period of 90 days. This guarantee does not extend to components damaged by im-
proper use nor does it extend to transportation to and from the factory.
In Canada: Manufactured Under License by McCurdy Radio Industries, Ltd.
SERVICE INFORMATION
GUARANTEE
MclNTOSH LABORATORY, INC.
2 Chambers Street
Binghamton, N. Y., U.S.A.
22 Front Street West, Toronto, Canada
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