User manual MCINTOSH MR65 SERVICE MANUAL

[. . . ] It offers the finest possible reception of FM monophonic and FM multiplex stereophonic broadcasts. Every desirable feature for your FM listening pleasure is included in the MR65 tuner. It is perfect for use in a stereo music system where nothing less than "THE Best" will do. Once you have enjoyed the outstanding performance of the MR65, you will understand why Mclntosh products have earned their reputation as "THE Best. " Your Mclntosh MR65 tuner will give you years of the finest possible FM reception, and will become a highly valued part of your home music system. TECHNICAL DESCRIPTION The MR65 tuner has a 6DS4 high-gain Nuvistor for the first RF amplifier. [. . . ] For best appearance in an open installation, it is suggested that you mount the MR65 in the attractive Mclntosh Model L66 finished wood cabinet. If the panel is at least ¼ inch or more in thickness, the tuner will be adequately supported by the four front panel mounting screws. Drill a 3/16 inch diameter hole through the back of the panel at each of the two points. Make certain that you hold the drill perpendicular to the panel so the holes will be accurately located on the front side of the panel. Using the previously drilled locating holes for correct alignment, carefully position the cutout template on the front panel. Scribe the rectangular cutout on the front panel and mark the positions of the six mounting holes. Drill the six 3/16 inch diameter mounting holes before cutting the panel opening. It is important that the cutout be just within the heavy black lines on the template. SHELF MOUNTING Locate the exact center of the proposed shelf area and scribe a line from the front to the back of the shelf. The SHELF CUTOUT TEMPLATE is marked for front panel thickness from ¼ inch to 1 inch. Fold the template on the line that corresponds to the thickness of the particular panel being used. Secure the chassis with the proper length 7 10-32 screws by inserting them up through the holes in the shelf, and into the threaded holes in the tuner chassis bottom. Tighten the 10-32 screws after you have first tightened the front panel screws. IMPORTANT Use of the wrong length 10-32 screws may cause electrical shorting in the tuner circuits. Attach the two metal panel end caps (packed with the tuner) on each end of the tuner panel by sliding onto the pins. (See Figure 10. ) The end caps are held by spring tension and can easily be removed if the tuner is to be taken out of the cabinet. MOUNTING IN THE L66 CABINET The Mclntosh L66 cabinet is supplied with complete instructions and all necessary hardware for installing the MR65 tuner. The Use the left hand pair of tuner AUDIO OUTPUT jacks for connecting to a conventional stereophonic control preamplifier. The output volume levels at these jacks are affected only by the tuner back panel dual concentric OUTPUT ADJ controls. The left hand pair of jacks is recommended when the tuner is used with a Mclntosh control preamplifier. Use the right hand pair of AUDIO OUTPUT jacks when you wish to use the tuner front panel volume control. Use these jacks for connecting directly to tape recorders, power amplifiers or any equipment without its own volume control. [. . . ] Tune to an FM station until the meter pointer is exactly in the center of the black scale area. Wait a few seconds and watch the meter pointer to see if it moves off the center of the black scale area. If the meter pointer changes position, adjust the red TUNING MTR thumb wheel control (under the right dial panel end cap) until the meter pointer moves back to the center of the black area. Turn the AUTO FREQ CONTROL up to MAX and again check for meter pointer movement. [. . . ]