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Your MR 73 FM/FM STEREO-AM
TUNER will give you many years of

pleasant and satisfactory performance.

If you have any questions concerning

the operation or maintenance of
this instrument, please contact:

CUSTOMER SERVICE

Mclntosh Laboratory Inc.

2 Chambers Street

Binghamton, New York 13903
Phone: 607-723-3512

Take Advantage of 3 years

of FREE Factory Service...

Fill in the Application NOW.

G U A R A N T E E  . . . 1

IF  Y O U ' R E IN A  H U R R Y ...2

I N S T A L L A T I O N  . . .  3 , 4

H O W  T O  C O N N E C T  . . . 5

B A C K  P A N E L  I N F O R M A T I O N  . . . 6

F R O N T  P A N E L  I N F O R M A T I O N  . . .  7 , 8

L I S T E N I N G  T O  T H E  M R  7 7  . . . 8

T E C H N I C A L  D E S C R I P T I O N  . . .  9 ,  1 0

P E R F O R M A N C E  L I M I T S  . . .  1 1

P E R F O R M A N C E  C H A R T S  . . .  1 2

B L O C K  D I A G R A M  . . .  1 3

GUARANTEE

Mclntosh Laboratory Incorporated guarantees this

instrument to be capable of performance as adver-

tised. We also guarantee the mechanical and elec-

trical workmanship and components to be free of
defects for a period of 90 days from date of pur-
chase. II such defects occur, Mclntosh Laboratory or

THREE YEAR FACTORY

An application for a FREE THREE YEAR FAC-

TORY SERVICE CONTRACT is included with this

manual. The terms of the contract are:

For Three Years from date of purchase —

1. Mclntosh will provide all parts, materials and

labor needed to return the measured perform-

ance of the instrument to the original per-

formance limits free of any charge. The

SERVICE CONTRACT does not cover any
shipping costs to and from the authorized
service agency or the factory.

2. Any Mclntosh authorized service agency will

repair all Mclntosh instruments at normal
service rates. To receive the free service
under the terms of the SERVICE CONTRACT,

the SERVICE CONTRACT CERTIFICATE must
accompany the instrument when taken to the

service agency.

3. Always have service done by a Mclntosh

authorized service agency. If the instrument
is modified or damaged as a result of unau-

thorized repair the SERVICE CONTRACT will

be cancelled.

one of its authorized agencies will repair the defect
at no cost to the purchaser. This guarantee does

not extend to components damaged by improper use
nor does it extend to transportation to and from the
factory or service agency.

SERVICE CONTRACT

4. The SERVICE CONTRACT is issued to you as

the original purchaser. To protect you from

misrepresentation this contract cannot be

transferred to a second owner.

5. The SERVICE CONTRACT is given to pur-

chasers who live in the 50 United States or

Canada only.

6. For your protection Mclntosh selects its

dealers carefully. Only one dealer in ten

qualifies for a McIntosh franchise. To receive
the SERVICE CONTRACT your purchase must
be made from a Mclntosh franchised dealer.

7. Your completely filled in application for a

SERVICE CONTRACT must be postmarked

within 30 days of the date of purchase of
the instrument.

8. To receive the SERVICE CONTRACT all infor-

mation on the application must be filled in.

The SERVICE CONTRACT will be issued when
the completely filled in application is received

at Mclntosh Laboratory Incorporated in Bing-

hamton, New York. If the application is not

received at Mclntosh Laboratory, only the
service offered under the 90-day guarantee

will apply.

Copyright ©1970 By Mclntosh Laboratory Inc.

1

CONTENTS

Summary of Contents for MR 73

Page 1: ...THE McINTOSH MR 73 SOLID STATE FM FM STEREO AM TUNER Price 1 25...

Page 2: ...h instruments at normal service rates To receive the free service under the terms of the SERVICE CONTRACT the SERVICE CONTRACT CERTIFICATE must accompany the instrument when taken to the service agenc...

Page 3: ...Lights when station is transmitting stereo pilot carrier for stereo broadcasting SIGNAL STRENGTH Indicates relative signal strength MODE SELECTOR Select from AM broadcast stereo FM broadcast with Auto...

Page 4: ...ag and the mounting template at hand The PANLOC professional mounting design eliminates the need for any shelf or bracket to support the MR 73 It is completely supported by its own mounting brackets T...

Page 5: ...template If necessary loosen the screws and push the brackets into alignment and retighten Insert the power cord through the opening Care fully slide the MR 73 into the opening so the rails on the bot...

Page 6: ...ENNA An unbalanced 75 ohm antenna can be con nected to the MR 73 A type F connector is used to connect the 75 ohm coaxial cable to the back panel FM ANT 75 input A VHF TV antenna is often effective wh...

Page 7: ...articular type of AM antenna used EXT position is for a conventional antenna usually of the out door type from 50 to 150 feet in length LOOP position is for the built in Ferrite Loopstick ANTENNA CONN...

Page 8: ...ength of the signal as received from the an tenna The higher the indication the stronger is the signal FM TUNING METER An FM station is correctly tuned when the meter needle is in the black area of th...

Page 9: ...rn the tuning knob to the desired station The SIGNAL STRENGTH meter will indicate the relative strength of the particular AM station being received Adjust the VOLUME control to desired listening level...

Page 10: ...lower distor tion a special matching transformer has been designed to interface the FM RF to the FM IF amplifier This matching transformer consider ably enhances the linear phase characteristics of th...

Page 11: ...erload protection against strong local stations than can be obtained with conven tional bipolar transistors The AM RF mixer is also a dual insulated gate MOSFET The use of MOSFET s in the RF amplifier...

Page 12: ...s RADIATION FCC requirements STEREO SEPARATION 35 dB at 1 000 Hz STEREO FILTER d B noise reduction STEREO INDICATOR Front panel multiplex stereo light activated by 19 000 Hz carrier only SCA FILTER 50...

Page 13: ...00 1 V 1 V 10 V 100 V 1mV 10mV 100mV dB 0 10 20 30 40 50 60 70 HARMONIC DISTORTION 1 2 8 4 0 20 100 1000 10000 20000 FREQUENCY IN HERTZ HARMONIC DISTORTION IF AMPLITUDE RESPONSE 10 20 30 40 50 60 70 R...

Page 14: ...Block Diagram 13...

Page 15: ...McINTOSH LABORATORY INC 2 CHAMBERS ST BINGHAMTON N Y 13903 607 723 3512 Design subject to change without notice Primed in U S A 038 448...

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