McIntosh MR-55, Instruction Manual

Page 1: ...INSTRUCTION MANUAL MclNTOSH MODEL MR 55 AM FM TUNER Serial No 1KOOO and up MclNTOSH LABORATORY INC 2 Chambers St Binghamton N Y U S A w w w e s k o n l i n e n l...

Page 2: ...ctor Three Positions Front End 21 K C Constant bandwidth band pass input Whistle Filter 70 D B rejection 10 K C FM Sensitivity 3 Microvolts at 100 modulation 75 K C Dev for less than 3 total noise and...

Page 3: ...he template Proceed with marking the lo cation of the six holes and the outline of the cutout on the front of the wooden cabinet panel IMPORTANT DRILL THE FOUR 3 16 INCH AND THE TWO 5 32 INCH HOLES BE...

Page 4: ...TWO EACH SIDE REMOVE 4 6 32 SCREWS ONE EACH CORNER 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 4 w w w e...

Page 5: ...stable operation of any tuner Do not put a solid back on the cabinet behind the tuner If the tuner is mounted vertically make sure sufficient ventilation is supplied Installation in the L 55 cabinet...

Page 6: ...enna terminals marked FM ANT Connect the terminals marked TO T V SET to the antenna terminals on the T V receiver with 300 ohm antenna lead When the MR 55 selector switch is in cither of the FM positi...

Page 7: ...brown bakelite balun card located approximately 2 inches behind the tuning knob flywheel The center conductor of the 75 ohm coaxial lead is attached to the screw terminal located 3 8 inch above the ch...

Page 8: ...utside antenna is impossible or impractical a 10 foot loop antenna is supplied The loop is attached between the terminals marked HI and LO on the AM ANT terminal strip The AM ANT terminating switch lo...

Page 9: ...rod 6 to 8 feet long driven into the earth The ground wire is connected to the terminal marked LO TO LONG WIRE AS HIGH ABOVE GROUND AS POSSIBLE If the tuner is connected to an outside ground as descr...

Page 10: ...balanced low impedance Interconnect between either of these jacks and the tuner input of your preamplifier by means of the 6 foot shielded cable supplied with your tuner Plug the A C cable from the tu...

Page 11: ...plifier can be plugged into the auxiliary A C outlet supplied on the back of the MR 55 This outlet is controlled by the A C switch on the front of the tuner SEE ANTENNA INSTALLATION INSTRUCTIONS 11 w...

Page 12: ...t signal strength to completely eliminate background noise The ultrasonic muting circuit has been so designed to permit only listenable signals through Signals with annoy ing background noise will be...

Page 13: ...he 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...

Page 14: ...Oscillator 10 7MC Point R Pin 6 V3 Oscillator Coupled to H Thru 0 MF Condenser and Terminating Resistance V T V M Test Point T2 T3 Upper and lower Slugs T5 for Maximum T7 T9 Defeat AVC Action at Poin...

Page 15: ...r Coupled to Antenna Terminals Thru 5 0 F Condenser Sens Switch at Max Antenna Terminals 600KC 1500KC Narrow Local Oscillator Adjust T15 at Lower Freq s and C102 at the Higher Freq s T15 C102 For Opti...

Page 16: ...C Deviation Thru Balun to Antenna Input or 75ohm Input With Termi nating Resistors Modulate With Variable External Source Audio Voltmeter Audio Output Determine Modulating Freq s at Which Audio Output...

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