McIntosh MR 73 Operating and installation instructions

SERVICE INFORMATION
STARTING WITH SERIAL NO. 10T01
McIntosh laboratory inc. 2 chambers street binghamton, new york
MR
73

MR 73
ELECTRICAL SPECIFICATIONS
PM TTINER SECTION
USEABLE SENSITIVITY
Better than 2,5 m-V (IHF useable
sensitivity)
SIGNAL TO NOISE RATIO
Better than 70dB
CAPTURE RATIO
Better than 1.5?dB
SPURIOUS REJECTION
90dB or greater
HARMONIC DISTORTION
Mono, less than 0.3%» Stereo, less
than 0 . 7 %.
IMAGE REJECTION
75dB or greater (at 100MHz)
STEREO SEPARATION
FREQUENCY RESPONSE
Better than 35dB at 1kHz.
Flat from 20Hz to 20kHz with standard
de-emphasis and 19kHz pilot filter
SCA FILTER
Better than 50 dB rejection
from 67 k Hz to 74 &Hz
AM TTINER SECTION
SENSITIVITY
Better than 12p-V at 1000kHz (using
external antenna input)
SIGNAL TO NOISE RATIO
Better than 55dB
HARMONIC DISTORTION
Less than 1 % at 30% modulation
FREQUENCY RESPONSE
Down 6dB at 5kHz
SELECTIVITY
-30dB at 10kHz
IMAGE REJECTION
60dB or greater at 1000kHz
OUTPUT LEVEL
GENERAL
POWER REQUIREMENTS
Fixed output, 2.5 volts
Variable output, 0 to 2.5 volts
117 volts AC 50-60Hz, 20 watts

MR 73
MR
73
BLOCK
DIAGRAM

POINTER DRIVE
TUNING CONDENSER DRUM
POINTER
ADJUSTMENT
, SCREW
Before stringing unit,
turn pointer adjustment
screw until pulley "A"
is in the center of its
travel.
Step 2 String unit as shown.
After stringing unit,
turn tuning shaft until
pointer is as far to
the left as it will go.
Turn the pointer adjust¬
ment screw until the
pointer coincides with
the zero bar of the
logging scale.
Turn the tuning knob
making the pointer move
back and forth from one
end of the dial scale
to the other. Return
pointer to the far left
and, if necessary, re¬
adjust pointer position.
TUNING CONDENSER DRUM
TUNING CONDENSER DRIVE
BLACK DIAL CORD
DIAL CORD SEQUENCE
(TO LEFT SIDE PULLEY B) WHITE J-
(TO IDLER PULLEY AND TUNING SHAFT) BLACK I
5 WHITE (TO RIGHT SIDE
PULLEY A )
. BLACK (TO TUNING SHAFT)
TUNING CONDENSER DRUM
POINTER DIAL STRINGING

R 328
NOTE II
L

1000
y
F/25V

SCHEMATIC NOTES
Unless otherwise specified: Resistance values are in ohms, 1/4 watt, and 10% tolerance;
capacitance values smaller than 1 are in microfarads (pF); capacitance values greater than
1 are in picofarads (pF); inductors are in microhenries (pH).
2. Printed circuit board components are outlined on the schematics by dotted lines. The circled
numbers around the dotted lines correspond to the numbers on the PC Board layouts.
3. The heavy lines on the schematics denote the primary signal path.
4. The terminal numbering of rotary switches is for reference only.
s indicated on the schematics are measured under the followi
conditions
Use of an 11 megohm input impedance VTVM
b. All voltages _+l 0/ with respect to chassis ground
or antenna terminals
d. AC input at 117 volts, 50/60 Hz
Front panel controls at:
Tuning indicator 100MHz (no signal)
AM (to measure AM section) Mode
Stereo (to measure FM
sect ion)
Vo 1ume
6. In units with Serial No's below 15T33: R434 is not used
In units with Serial No's below 15T74: R112 is 3.3k; R20 and C33 are used; R15 is connected
as shown by dotted lines and center terminal of AM sensitivity switch (S2) is connected to
ground as shown by dotted line.
In units with Serial No's from 24T00 to
and XF-2 is McIntosh Part No. 044-045A.
3T50: C109 and C113 are not used; R106 is 680Q
In units with Serial No's below 3 3 T 5 0 : R1 0 5 is 1 0 k ; R1 0 7 S- Rl 1 3 are 100ft 10%; C4 is
and L 5 Is 1 .2 pH.
10. In units with Serial No's below 27T84: R21 is not used
In units with Serial No's below 33T50: R329 is not used; R307 is 200k; there is no connection
from R307 to Pin 12 of MPX PC board and Pin 14 of MPX PC board is connected to the arm of R307
only.
In units with Serial No's below 33T50, PC board 043-975 is used
of Q402 and Q403 as shown by dotted 1ine.
It connects the collector
R409
9405
R405
C405
R407
COAX
0401
R403
R4I9
C409
G405
C403 +
Y EL/WHT
COAX
R400
R408
Q4C2
RED/WHT
RC04
C404
G40C
R406
0404
R402
R418
R4I0
R4I2
R42?
AMPLIFIER & VOLTAGE REG PC. BOARD 044

Rt03
C
CIOI

FM
ANTENNA
RF CHASSIS
FM'RF COIL
AM EXT.
ANTENNA i
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.. „ 1
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NOTE 7-i-
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AM ANT TRIMMING
NUIt 7
y\~r~
S * 2 .j.. -
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FM/AM TUNER
SECTION
MR73 154-436

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If
the
necessary
test
equipment
is
not
available,
alignment
should
not
be
7.
Harmonic
Distortion
Analyzer
(Hewlett-Packard
333A
attempted.
For
additional
information,
contact
Customer
Service
Department,
or
equivalent)
McIntosh
Laboratory
In.,
2
Chambers
Street,
Binghamton,
New
York
13903
(telephone
607-723-3512).

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REPLACEMENT PARTS
All parts not listed are common items Obtain¬
able from radio parts jobbers.
Replacement parts may be obtained when ordered
by PART NUMBER from:
McIntosh Laboratory, Inc.
Customer Service Department
2 Chambers Street
Binghamton, New York 13903
(telephone [phone])
Symbol
N umber
CAPACITORS
Description
Part
N umber
C2 3
Mylar 22pF 200V
064-087
C24
Mylar
.1 pF 250V
064-086
Cl 1 1 El ect.
lOOpF
15V
066-127
C210 Tant. Elect. 1 . 5pF
35V 066-092
C218
El ect.
lOOpF
15V
066-127
C301 Myl ar . 22 pF 50V
064-068
C305
El ect. lOOpF 15V
066-127
C308 Elect.
1 OOpF
15V
066-127
C31 3
Mylar
* 1 pF
250V
064-067
C31 5
Myl ar . 22 pF
250V
064-068
C402,403
E1ect. lOpF 20V
066-149
C406,407
El ect.
22 pF 20V
066-148
C410.411 El ect.
6.8pF
35V
066-146
C4l 3
Myl ar . 2 2 pF
250V
064-068
C41 4
Elect.
5/300/150/1000
250/60/60/25
066-145
DIODES
D1
Ge. signal
diode
070-003
0101,102
Ge. signal
diode
070-003
0103,104 Ge. signa1 d i ode
070-003
D1 0 5,10 6 Si. signal
diode 070-022
D201
Ge. si gna1
diode
070-003
D202,203
Ge. signal
diode
070-003
D 301
Bias diode
070-046
D302.303
Si. signal d i ode
070-022
D304
Si. si gna1
diode
070-022
D305.306
Ge.. signal
d i ode
070-003
D307.308
Ge. signal
diode
070-003
D401
Zener diode 16V
070-048
D402,403 S i . rectifier
070-031
D404
Si. rectifier
070-031
CHOKES
LI
FM antenna co i 1
122-069
L2
FM RF coi1
122-070
L3 Choke 1 .2pH
122-011
L4
Choke .47pH
122-010
L5
Choke 2.5pH
122-033
L6
FM mixer coil
122-071
L7
FM local oscillator coil
122-072
L8
AM Loop antenna
122-074
L9
AM antenna trimming coil
122-073
L1 0
Choke 2-5pH
122-033
L)01,102
Choke 75pH
I22-013
L20 1
AM osci1 Iator coil
122-066
L202
Choke 100MH
122-004
L301
Choke ImH
122-065
L302
Filter coil (19kHz phase)
122-080
L303,304
Filter coi1 (SCA)
122-079
TRANS 1ST0RS
Q1 ,2
Si. j unction F.E.T.
132-049
Q3
Si. j unction F.E.T.
132-049
Q4
Si. N PN t ransis tor
132-015
Q5
Si. M.O.S. F.E.T.
132-064
Q201
Si. j unction F.E.T.
132-049
Q202
Si. M.O.S. F.E.T.
132-064
Q203
Si. NPN transistor
132-041
Q204,205
Si. M.O.S. F.E.T.
132-061
Q301
S i . NPN t ransis tor
132-057
Q302
S i . NPN transistor
132-052
Q 30 3,304
Si. NPN transistor
132-057
Q305
S i . NPN transistor
132-057
Q306
Si. NPN t ransis tor
132-042
Q400.401
Si. PNP transistor
132-056
Q402,40 3
Si. NPN transistor
132-041
Q404.405 S i . NPN transistor
132-052
Q406
Si. NPN t ran sis to r
132-072
Q407 Si . NPN transistor
132-041
POTENTIOMETERS
R22 1
AM level control
134-177
R244
Volume cont ro1
134-217
R307 Muting cont rol
134-216
R309
FM level control
1 34-197
R424
Separation adjust
134-212
R435
Meter adjust
134-197
F200
Fuse
FUSES
•5A Slo-Blo 089-020