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WARRANTY STATION MAC 1500 STEREO RECEIVER
SERVICE MANUAL
CONTENTS
INTRODUCTION FM ALIGNMENT CHART
1 2-3
MULTIPLEX DECODER ALIGNMENT CHART _ 4-5 SCHEMATIC TESTS AND ADJUSTMENTS
DIAL STRINGING
6-7 8
8
PARTS
LIST
9-14 15 16 16
TOP AND BOTTOM VIEWS SPECIFICATIONS BLOCK DIAGRAM
MAC1500
McINTOSH
AUDIO COMPANY
2 Chambers St., Binghamton, N.Y. 13903
MAC 1500 STEREO RECEIVER
INTRODUCTION
All Mclntosh tuners are carefully aligned and tested at the factory using the finest available test equipment. All Mclntosh tuners will meet their published specifications when shipped from the factory. After extensive operation, especially when tubes have been replaced, it may be desirable to realign the timer circuits for best performance. This manual gives complete information on the circuit realignment procedure for the MAC 1500 receiver. The test equipment listed below (or its equivalent) is necessary to properly align a MAC 1500. The accuracy of the alignment will be directly related to the accuracy and calibration of the test equipment used. FM Signal Generator (Measurements 210A or equivalent)
VTVM
Multiplex Generator (RCA WR51A or equivalent)
10.7 MC Generator (Preferably crystal controlled) Oscilloscope (Hewlett -Packard 120B or equivalent)
Harmonic Distortion Analyzer (Hewlett-Packard 330B or equivalent) If the necessary test equipment is not available, alignment should not be attempted. You may contact the Mclntosh Customer Service Department for additional information.
Customer Service Mclntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York Our telephone number is 723-5491 The direct dial area code is 607
1
MAC 1500
STEPS
TUNER DIAL SETTING
SIGNAL GENERATOR FREQ. COUPLING
INDICATOR TYPE CONNECTED TO
MODULATION
1
Point of no interference and no signal
10.7MC
Through external .01 MFD capacitor to mixer grid (pin 4 or 6DS4, V2) SAME
cw
VTVM
TP#1
SAME
SAME
SAME
SAME
Pin 1 of T4
2 3 4 5
SAME SAME SAME SAME SAME
TP#2
105MC
105MC
300 ohm antenna terminals with matching network* SAME SAME SAME SAME
400 cycles 75KC deviation (100% modulation) SAME SAME SAME SAME
VTVM connected to TP#2 and. scope connected to L or R tape output SAME SAME SAME VTVM connected to TP#2; scope and distortion analyzer connected to L or R tape output See note ** at bottom of page
90MC 105MC 90MC 90MC
90MC 105MC 90MC 90MC
6
7
8
9
105MC and 90MC 105MC and 90MC 90MC SAME 50 cps 150KC deviation Approx. 5 microvolts at antenna terminals 400 cycles 75KC deviation (100% modulation) SAME
10 11
90MC
SAME
Scope connected to L or R tape output VTVM connected to TP#1 ; scope and distortion analyzer connected to L or R tape output
90MC
90MC
SAME
2
FM ALIGNMENT
ADJUST TEST LIMITS REMARKS
Before making any adjustments, set the controls as follows: a) Input selector switch to FM mono, b) Volume control maximum CCW. c) Muting pot maximum CW. d) Muting OUT. e) Stereo light adjust maximum CW. Top (secondary) and bottom (primary) of T1.T2, T3 Primary and secondary of T4 Maximum possible negative voltage Shunt to ground the winding not being adjusted. Do this with a .01 MFD capacitor in series with a 1K resistor. Attenuate signal generator until output voltage at TP#1 is less than 1.5 volts with one IF transformer winding shunted. IF transformers have terminal #1 marked with a green dot and_ are numbered clockwise. Muting pot. MUST be maximum CW.
Maximum possible negative voltage (should be 20 to 30 volts) Adjust for 0 volts
Secondary (top) of T-5
The primary (bottom) of T-5 should be adjusted only if a distortion analyzer is available.
-4
L-4
Maximum negative voltage SAME SAME SAME 0.5% distortion or less Repeat steps 4 and 5 until dial calibration is accurate. As output increases, attenuate signal generator to keep maximum output at TP#1 to less than 1 volt. Repeat steps 6 and 7 until output is as high as possible. Use a strong signal from the FM generator. Adjust T-5 primary for minimum distortion. IF A DISTORTION ANALYZER IS NOT AVAILABLE, OMIT THIS STEP. DO NOT ADJUST T-5 PRIMARY. Observe direction of tilt of overall response curve at 105MC and 90MC. If direction is the same, adjust L-2 at 100MC for minimum tilt. Re-check tilt at 90MC and 105MC. If direction is not the same, adjust L-2 (at 90MC) and L-3 (at 105MC) for minimum tilt. Check tilt again at 100MC. With FM generator set for 2.5 microvolts output, place muting control to "IN." Adjust the muting threshold control to the point at which the sine wave on the scope becomes erratic. IHFM Sensitivity 2.5 microvolts for 3% total noise and distortion Step 11 is an overall sensitivity check. It requires a distortion analyzer and FM signal generator with attenuator. With 2.5 microvolts input at the 300 ohm terminals, TP#1 voltage should be .45 volts or more.
C-2, C-3
L-1, L-2, L3
Primary (bottom) of T-5
L-2, C-3
Minimum tilt
Muting threshold control
3
MAC 15 00 MULTIPLEX
TUNER DIAL SETTING
Point of no interference or signal SAME SIGNAL GENERATOR FREQ. COUPLING INDICATOR TYPE Audio VTVM CONNECTED TO L or R tape output
STEPS
MODULATION
1
Audio generTP#2 ator set to 67KC 0.5 volts output or less MPX generator with 19KC pilot attenuated to approx. 5% level. (5% level is ½ of normal 10% level). 19KC pilot MUST be attenuated for correct alignment 100MC modulated by MPX generator. 19KC pilot at normal output SAME SAME
DC VTVM
Pin 9 of 6EA8
2
100MC
3
SAME
300 ohm antenna terminals with matching network. (See * previous page)
1KC 100% modulation (34 KC deviation) modulating left or right only SAME
Audio VTVM
Pin 1 or 2 of T-7
SAME
4 5 6 7 8
SAME SAME SAME SAME
Audio VTVM and scope SAME
L or R tape output
SAME
SAME SAME SAME
SAME SAME Tune to a strong mono FM station
SAME SAME SAME
SAME Turn off 1 KC audio modulation
SAME SAME
MPX stereo indicator light on receiver
SAME SAME
4
DECODER ALIGNMENT
TEST LIMITS Adjust for minimum voltage
ADJUST
REMARKS
67KC Trap (L-6)
Stereo light must be on. This is done by adjusting the "MPX Light Adj." control, R-12.
T-6 top and bottom; L-5
Adjust for maximum voltage
Stereo light must be off.
·~
T-7 bottom core
SAME
Stereo light must be completely on.
T-7 top core
Adjust for stable scope display
1. Turn off 19KC pilot on MPX generator. 2. Adjust upper core of T-7 to obtain a stable and uniform 1 KC signal scope display. This adjustment may be critical, so turn core very slowly. 3. Turn 19KC pilot back on. Modulate left channel and measure right channel output. Adjust L-5 for minimum right channel output (maximum separation). Be sure all test leads are removed from TP#2 for separation tests. Modulate right channel and measure left channel output. Separation in steps 5 and 6 should be at least 30db.
L-5
30db separation or more SAME
This step checks the rejection of 19KC and 38KC frequencies. Residual output should be at least 40db below modulated output. MPX light adjust control R-12 Turn control until light comes on. Then back off just enough to cause the light to go off. Then back off about 1/8 of a turn more. Light should operate ONLY on a MPX signal.
5
6
7
PREAMP/AMP TESTS AND ADJUSTMENTS
All adjustments should be made after a minimum of a 10 minute warm-up. 1 2 Remove the 12AX7 (V-9). Measure the voltage at TP#3. Voltage should be 0.7 volts positive. If it is not 0.7 volts, adjust R-8. Do likewise with TP#4 and R-9, TP#5 and R-10, TP#6 and R-11. Re-insert the 12AX7.
3 4
5 Feed a 1 KC signal into AUX. Drive the amp to full 30 watts output. Be sure all controls are set for a flat response. Check to be sure the channels have equal output with equal drive from the audio oscillator. If channels are unbalanced, adjust R-55, This control is found on the left preamp printed circuit board. It will vary the output of the left channel. The preamp cover must be removed to gain access to this control.
DIAL STRINGING
6
Measure harmonic distortion at 30 cycles. Adjust R-6 for minimum distortion on the left channel and R-7 for the right. Distortion must be less than 0.5%. The bottom cover must be removed to adjust these controls. They have blue plastic knobs. Now measure distortion at 2KC and 20KC. Must be less than 0.5% at full output. Next, feed a signal thru the phono inputs. Check for correct RIAA equalization. Remove all inputs. Check hum and noise on phono 1. Should be at least 60db below rated output.
7 8 9
8
MAC 1500 PARTS LIST
TUBES
ITEM NO.
V-1 USE
TUBE NUMBER 6DS4 6DS4 6AU6 6AU6 6AU6 6CS6 6EA8 12AU7 12AX7 12AU7 12AU7 7591 7591 7591 7591
PART NUMBER 165-013 165-013 165-004 165-004 1 65-004 165-01 1 1 65-044 165-01 8 165-019 165-018 165-018 165-022 165-022 1 65-022 165-022
HF Amplifier
Mixer 1st IF Amplifier 2nd IF Amplifier 3rd IF Amplifier, 1st Limiter 4th IF Amplifier, 2nd Limiter 19KC Amplifier, Indicator Control MPX 38KC Oscillator Voltage Amplifier Left Channel Driver Right Channel Driver Left Channel Output Left Channel Output Right Channel Output Right Channel Output
V-2 V-3 V-4
V-5 V-6 V-7
v-8
V-9 V-10 V-11 V-12 V-13 V-14 V-15
TRANSISTORS
ITEM NO.
Q-1 Q-2 0-3 Q-4 Q-5 Q-6 Q-7 Q-8 Q-9 Q-10
Q-11
USE
Local Oscillator Control Amplifier MPX Lamp Control Oscillator On-Qff Control Left Channel Audio Amplifier Right Channel Audio Amplifier Left Channel Audio Amplifier Right Channel Audio Amplifier Left Channel Low Level Amplifier Right Channel Low Level Amplifier Left Channel Emitter Follower Right Channel Emitter Follower Left Channel Low Level Amplifier Right Channel Low Level Amplifier Left Channel Emitter Follower Right Channel Emitter Follower Left Channel Emitter Follower Right Channel Emitter Follower Left Channel Voltage Amplifier Right Channel Voltage Amplifier
TRANSISTOR NUMBER TA2556/40244 2N3638 2N3391A 2N3391A 2N3391A 2N3391A 2N3391A 2N3391A 2N3391A 2N3391A 2N3391A 2N720A 2N720A 2N339IA 2N3391A 2N3391A 2N3391A 2N720A 2N720A
PART NUMBER 1 32-008 132-007 132-010 132-004 1 32-004 132-004 1 32-004 132-004 132-004 132-004 132-004 132-004 1 32-002 132-002 1 32-004 132-004 132-004 132-004 132-002 1 32-002
Q-12 Q-13 Q-14 Q-15 0-16 Q-17 Q-18 Q-19 Q-20
DIODES
ITEM NO.
D-1 D-2 D-3 D-4 D-5
DESCRIPTION Diode Diode Diode Diode Diode Diode [Matched pair 1N542) Diode (Matched pair 1N542) Diode (Matched pair 1N542] Diode (Matched pair 1N542] Diode (Matched pair 1N542] 800 PIV @ 750MA Silicon Rectifier 600 PIV @ 750MA Silicon Rectifier 600 PIV @ 750MA Silicon Rectifier 800 PIV @ 750MA Silicon Rectifier 400 PIV @ 750MA Silicon Rectifier 10 V @ 400 MW Zener Rectifier
DIODE NUMBER FD100 FD100 FD100 FD100 FD100 IN542 1N542 1N543 IN542
PART NUMBER 070-022 070-022 070-022 070-022 070-022 070-003 070-003 070-003 070-003 070-003 070-017 070-016 070-016 070-017 070-015 070-011
D-6
0-7 D-8 D-9 D-10 D-11 D-12 D-13 D-14 D-15 D-16
9
CONTROLS
ITEM NO.
R-1 R-2 R-3 R-4 R-5 R-6 R-7 R-8 R-9 R-10 R-11 R-12 R-55
FUNCTION Balance Control Bass Control Treble Control Volume Control Muting Adjust Control Driver Balance Control Driver Balance Control Bias Adjust Control Bias Adjust Control Bias Adjust Control Bias Adjust Control MPX Light Adjust Control Left Channel Gain Control
RESISTANCE 500K-500K IM-1M 500K-500K 60K-60K 100K 5K 5K 100K 100K 100K 100K 100K 5K
PART NUMBER 134-165
134-117 134-118
134-164 134-102 134-103 134-103 134-102 134-102 134-102 134-102 134-102 134-120
SWITCHES
ITEM NO. FUNCTION Rotary Switch SS-26 19/32 Trigger Slide Switch SS-50 7/32 Trigger Slide Switch SS-50 19/32 Trigger Slide Switch (S used) DESCRIPTION Input Selector Muting On -Off Speaker On -Off Stereo/Mono, Tape Monitor, LF and HF Fillers, Loudness. PART NUMBER 1 46-096 148-003 148-006 1 48-007
S-1
TRANSFORMERS
ITEM NO.
T-1 T-2
FUNCTION FM-IF FM- IF FM-IF IF (Muting) FM Discriminator 19KC Amplifier 38KC Oscillator
PART NUMBER 162-005 162-004 162-004 162-029 1 62-027 162-010 162-009 076-006 159-062 159-062 159-061
T-3 T-4 T-5
T-6 T-7 T-8 T-9 T-10 Ml
Balun Output (Left)
Output (Right) Power
CAPACITORS
ITEM NO. DESCRIPTION Variable FM Trimmer (Ceramic) Trimmer (Ceramic) Trimmer (Glass) Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Feed -Thru Ceramic Feed-Th r u Ceramic Disc. Ceramic Tubular Ceramic Disc. Ceramic Disc. Ceramic Tubular Ceramic Disc. Ceramic Feed-Th ru Ceramic Feed-Thru Ceramic Feed-Thru Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Feed -Thru Ceramic Feed-Thru Ceramic Disc. Ceramic Disc. CAPACITANCE
1-8 PF 1-8 PF
TOLERANCE
PART NUMBER 059-006 060-001 060-001 060-002 061-040 061-035 061-035 061-036 061-036 061-009 061-005 061-040 061-009 061-003 061-009 061-036 061-036 061-036 061-040 061-009 061-040 061-036 061-036 061-040 061-043
C-1
C-2 C-3 C-4 C-5 C-6 C-7
C-8
C-9
C-10 C-11 C-13 C-16 C-17 C-18 C-19 C-20 C-21 C-22 C-23 C-24 C-27 C-28 C-29 C-30
.005MFD .001 MFD .001 MFD ..001MFD .001MFD 10PF 5PF
.005 10PF 3PF 10PF .001 MFD .001MFD .001 MFD
+80-20%
20% NPO ±.25PF N150 +80-20% 20% NPO ±.25PF 20% NPO
..005MFD
10PF .005 MFD .001 MFD .001MFD .005MFD .01 MFD
+80--20% 20% NPO +80-20%
+80-20% +80-20%
10
CAPACITORS
HEM NO.
C-31 C-32
DESCRIPTION Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Tubular Flat Foil Ceramic Feed-Thru Ceramic Feed-Thru Ceramic Feed-Thru Ceramic Feed-Thru Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Feed -Thru Ceramic Disc. Silver Mica Ceramic Disc. Ceramic Disc, Ceramic Disc. Ceramic Disc. Silver Mica Silver Mica Electrolytic Ceramic Disc. Ceramic Disc. Silver Mica Silver Mica Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Tubular Ceramic Tubular Ceramic Disc. Ceramic Disc. Flat Foil Flat Foil Ceramic Disc. Flat Foil Flat Foil Ceramic Disc. Ceramic Disc. Electrolytic Electrolytic Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Disc. Ceramic Tubular Ceramic Tubular Flat Foil Flat Foil Flat Foil Flat Foil Molded Film Molded Film Electrolytic Electrolytic Mylar Mylar Ceramic Disc. Ceramic Disc. Flat Foil Flat Foil Electrolytic Electrolytic Ceramic Disc. Ceramic Disc. Mylar Mylar Mylar Mylar Mylar
CAPACITANCE 12PF .1MPD .005MFD .005MFD .01 MFD
15PF
VOLTAGE
TOLERANCE
20% NPO +80-20% +80-20% +80--20% +80-20% ±.75PF N150 20%
PART NUMBER 061-010 061-049 061-040 061-040 061-043 061-012 064-027 061-036 061-036 061-036 061-036 061-049 061-040 061-040 061-008 061-010 061-019 061-021 061-045 063-004 061-023 061-035 061-035 061-045 063-002 061-002 066-047 061-049 061-028 063-005 063-005 061-040 061-040 061-040 061-040 061-029 061-029 061-031 061-031 061-043 061-043 064-024 064-024 061-009 064-024 064-024 061-049 061-049 066-018 066-018 061-049 061-049 061-051 061-051 061-031 061-031 064-024 064-024 064-024 064-024 064-013 064-013 066-018 066-018 064-019 064-019 061-038 061-038 064-036 064-036 066-047 066-047 061-019 061-019 064-016 064-016 064-012 064-012 064-012 064-012 061-031 061-031
C-33 C-34 C-35 C-36 C-37 C-38 C-40 C-41 C-42 C-43 C-44 C-45 C-46 C-47 C-48 C-49 C-50 C-51 C-52 C-53 C-54 C-55 C-56 C-57 C-58 C-59 C-60 C-61 C-62 C-63 C-64 C-65 C-66 C-67 C-68 C-69 C-70 C-71 C-72 C-73 C-74 C-75 C-76 C-77 C-7B C-79 C-80 C-81 C-82 C-83 C-84 C-85 C-86 C-87 C-88 C-89 C-90 C-91 C-92 C-93 C-94 C-95 C-96 C-97 C-98 C-99 C-100 C-101 C-102 C-103 C-104 C-105 C-106 C-107 C-108 C-109
C-110 C-111
C-112 C-113
Mylar
Ceramic Tubular Ceramic Tubular
.1MFD .001 MFD .001 MFD .001 MFD .001 MFD .1MFD .005MFD .005MFD 6.8PF 12PF 47PF 100PF .02MFD .0027MFD 100PF .001MFD .001MFD .02MFD .0012MFD .0012MFD 100MFD _1MFD 220PF .0047MFD .0047MFD .005MFD .005MFD .005MFD .005MFD 330PF 330PF 430PF 430PF .01 MFD .01 MFD .22MFD .22MFP 10PF .22MFD .22MFD .1MFD .1MFD 100MFD 100MFD .1MFD .1MFD .0012MFD .0012MFD 430PF 430PF .22MFD .22MFD .22MFD .22MFD .22MFD .22MFD 100MFD 100MFD .47MFD .7MFD .0015 MFD .0015MFD .047MFD .047MFD 100MFD 100MFO 47PF 47PF .25MFD .25MFD .1MFD .1MFD .1MFD .1MFD 430 PF 430PF
40V
100V
+80-20% +80-20% +80-20% 20% NPO 20% NPO 20% N470 20% +80-20% 5% 10% N1500
100V 100V 3V
+80-20% 5% 5% +80-20% 20% 5% 5% +80-20% +80-20% +80--20% +80-20% 10% 10% 5% 5% +80--20% +80-20% 20% 20% 20% NPO 20% 20% +80-20% +80-20%
40V 40V 40V 40V
12V 12V
40V 40V 40V 40V 200V 200V 12V 12V 100V 10CV
+80-20% +80-20% 10% 10% 5% 5% 20% 20% 20% 20% 20% 20%
40V 40V 3V 3V
10% 10% 10% 10% 20% 20%
400V 400V 600V 600V 600V 600V
20% N470 20% N470 10% 10% 10% 10% 10% 10% 5% 5%
11
CAPACITORS
ITEM NO,
C-114 C-115 C-116 C-117 C-119 C-120 C-121 C-122 C-123 C-124 C-125 C-126 C-127 C-128 C-129 C-130 C-131 C-132 C-133
DESCRIPTION Mylar Mylar Ceramic Disc. Ceramic Disc. Mylar Electrolytic Electrolytic Tubular Tubular Tubular Electrolytic Ceramic Disc. Ceramic Feed-Thru Ceramic Disc. Fixed Composition Fixed Composition Ceramic Tubular Ceramic Disc. Ceramic Tubular Ceramic Disc. Ceramic Disc. Ceramic Disc.
CAPACITANCE
.1MFD .1MFD .005MFD .005MFD .47MFD 60-40MFD 40-40-40 MFD 50MFD 100MFD 50MFD 50-50-5050MFD .001 MFD .001 MFD .005MFD .18PF .18PF 430PF .02MFD 5PF
VOLTAGE
125V 125V
TOLERANCE
10% 10%
PART NUMBER 064-028 064-028 061-052 061-052 064-020 066-026 066-032 066-014 066-018 066-014 066-036 061-035 061-036 061-040 069-001 069-001 061-031 061-045 061-007 061-025 061-025 061-004
C-118
1400V 1400V 200V 500V-500V 450V-300V- 150V 50V 12V 50V 200V-200V200V-200V
10%
C-134 C-135
1SOPF 150PF 4.7PF
+80-20% 10% 10% 5% +80-20% ±.25PF N220 20% 20% 20% NPO
COILS
ITEM NO.
L-1 L-2 L-3
DESCRIPTION Antenna Coil R.F. Coil Mixer Coil OSC. Coil Peaking Coil Filter Coil Neutralizing Choke Parasitic Choke RF Choke RF Choke RF Choke RF Choke RF Choke RF Choke RF Choke RF Choke RF Choke RF Choke Peaking Coil Filter Coil Filler Coil
VALUE
PART NUMBER 122-035 1 22-054 1 22-055 1 22-056 122-008 122-009 122-033 122-028 122-011 122-011 122-011 122-011 122-011 122-011 122-011 122-011 122-011 122-013 122-014 122-015 122-015
L-4
L-5 L-6 L-7 L-8 L-9 L-10 L-11
L-12
19KC 67KC Trap 2.5 Micro H 3%
L-13
L-14
L-15 L-16 L-17 L-16 L-19 L-20 L-21
1.2 Micro H 1.2 Micro H 1.2 Micro H 1.2 Micro H 1.2 Micro H 1.2 Micro H 1.2 Micro H 1.2 Micro H 1.2 Micro H 75 Micro H 38 Micro H Lo Pass Lo Pass
RESISTORS
ITEM NO.
R-13 R-14 R-15 R-16
RESISTANCE
47K 100 ohms 15K 3.3K 220 ohms
TOLERANCE
10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10%
WATTAGE
PART NUMBER 136-339 136-068 136-377 136-385 136-396 136-110 136-373 136-236 136-068 136-110 136-068 136-152 136-278 136-339 136-222 136-301 136-110 136-145 136-372 136-373 136-180 136-373 136-124
¼W
½w
¼W ¼W
R-17 R-16 R-19 R-20 R-21 R-22 R-23 R-24 R-25 R-26 R-27 R-2S R-29 R-30 R-31 R-32 R-33 R-34 R-35
¼W
½W ¼W ½W ½W ½W
½W
1K
470 K 1M 100 ohms
1K 100 ohms
10K 10M 47K 470 K 100K 1K 6.8 K 220K 470K 47K 470K 2.2K
½W ½W
¼W
¼W ½W ½W
½W
¼W
¼W ½W
¼W
½W
12
RESISTORS
ITEM NO. R-36 R-37 R-38 R-39 R-40 H-41 R-42 R-43 R-44 R-45 R-46 R-47 R-48 R-49 R-50 R-S1 R-52 R-53 R-54 R-60 R-61 R-62 R-63 R-64 R-65 R-66 R-67 R-68 R-69 R-70 R-71 R-72 R-73 R-74 R-75 R-76 R-77 R-78 R-79 R-80 R-81 R-82 R-83 R-84 R-85 R-86 R-87 R-88 R-89 R-90 R-91 R-92 R-93 H-94 R-95 R-96 R-97 R-98 R-99 R-100 R-101 R-102 R-103 R-104 R-105 R-106 R-107 R-108 R-109 R-110 R-111 R-112 R-113 R-114 R-115 R-116 R-117 R-118 R-119 R-120 R-121 R-122 R-123 RESISTANCE 220 ohms 10K 10K 22 K 39K 2.2K IK 1M 470 ohms 4.7K 2.7 K 1M 1M 1M 4.7K 1.2K 1K 4.7K 100K 220K 100K 6.8K 22K 47K 47K 47K 47K 150K 150K 1M 1M 4.7M 4.7M 6.8 K 6.8K 1.8K I.8K 470K 470K 1M 1M 4.7M 4.7M 1K 1K 1M 1M 1.2K 1.2K 100K 100K 27K 27K 220K 220K 680 ohms 630 ohms 15K 15K 3.3M 3.3M I30K 180K 47K 47K 22K 47K 22K 47K 47K 47K 1M 1M 1M 1M 27K 27K 100K 100K 470K 470K 18K 18K TOLERANCE
10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% J0% 10% 10% 10% 10% 10% 10% 10% 10% 5% 5% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 5% 5% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 5% 5% 10% 10% 10% 10% 10% 10% 5% 5% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10%
WATTAGE
PART NUMBER 136-082 136-382 136-382 136-166 136-370 136-367 136-110 136-303 136-295 1 36-298 136-297 136-303 136-303 136-236 1 36-298 136-114 1 36-296 136-298 136-301 136-372 136-301 136-145 136-369 136-339 136-339 136-339 1 36-339 136-371 136-371 136-303 136-303 1 36-374 136-374 136-368 136-368 136-381 136-381 136-373 136-373 136-303 1 36-303 136-374 136-374 136-296 136-296 136-303 1 36-303 1 36-394 136-394 136-301 136-301 136-379 136-379 136-372 1 36-372 136-378 136-378 136-377 136-377 136-380 136-380 1 36-387 136-387 136-339 136-339 136-369 1 36-339 1 36-369 136-339 136-388 136-388 136-303 136-303 136-303 136-303 136-379 136-379 136-301 136-301 136-373 136-373 136-386 136-386
½W
¼W ¼W ½W ¼W
¼W
½W ¼W ¼W ¼W ¼W ¼W ¼W
½W
¼W ½W ¼W ¼W
¼W
¼W ¼W ½W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W
¼W
¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W
13
RESISTORS
ITEM NO.
R-124 R-125 R-126 R-127 R-128 R-129 R-130 H-131 R-132 R-133 R-134 R-135 R-136 R-137 R-J3S R-139 R-140 R-141 R-142 R-143 R-144 R-145 R-146 R-147 R-148 R-149 R-150 R-151 R-152 R-153 R-151 R-155 R-156 R-157 R-158 R-159 R-160 R-161 R-162 R-163 R-164 R-165 R-166 R-167 R-168 R-169 R-170 R-171 R-172 R-173 R-174 R-175 R-176 R-177 R-178 R-179 R-180
RESISTANCE
7.5K 4.7K 7.5K 4.7K 150 ohms 150 ohms 5.6K 5.6K 3.3K 3.3 K 100 ohms 100 ohms 330K 330K 15K 15K 1.2M 1.2M 18K 18K 27K 27K 30K 30K 220K 220K 220K 220K 22K 4.7K 4.7K 4.7K 4.7K 1 5 ohms 1 5 ohms 15 ohms 15 ohms 1.8K 1.8K 47 ohms 47 ohms 2.2M 900 ohms 3.6 K 33 K 33K
TOLERANCE
5% 10% 5% 10% 10% 10% 5% 5% 10% 10% 5% 5% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 5% 5% 10% 10% 10% 10% 10% 10% 10% 10% 10% 5% 5% 5% 5% 5% 5% 20% 20% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 20% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10% 10%
WATTAGE
PART NUMBER 136-376 136-298 136-376 1 36-298 136-294 136-294 136-397 136-397 136-131 136-131 136-067 136-067 136-215 136-215 136-159 136-159 136-240 1 36-240 136-313 136-313 136-316 136-316 136-317 136-317 1 36-372 136-372 136-372 136-372 136-166 136-138 136-138 136-138 136-138 1 39-034 1 39-034 139-034 139-034 136-120 136-120 1 36-323 1 36-323 136-250 139-012 139-013 136-173 136-173 139-033 139-033 136-31 1 136-163 1 39-009 139-009 139-009 136-329 136-303 136-303 136-110 136-110 136-222 136-379 136-379 136-303 136-303 136-110 136-382 1 36-068 136-296 136-373
¼W ¼W ¼W ¼W ¼W ¼W ¼W ¼W ½W
½W
½W
½W
½W ½W ½W ½W ½W ½W
1W 1W 1W 1W 1W 1W ¼W ¼W ¼W ¼W ½W ½W ½W ½W ½W 1W 1W 1W 1W ½W ½W
2W 2W
½W
5W 5W
6K 6K
8.2K 18K 220 ohms 220 ohms 220 ohms 1.5K 1M
½W ½W 5W
5W
1W ½W 5W
5W 5W 2W ¼W ¼W ½W
1M 1K
1K 470K 27K 27K 1M 1M 1K 10K 100 ohms 1K 470K
MSI
R-182 R-183 R-184 R-185 R-186 R-187 R-188 R-189 R-190 R-191
½W
½W
¼W ¼W ¼W ¼W ½W ¼W
½W
¼W ¼W
MISCELLANEOUS
Lamp, MPX #1850 Lamp, Incandescent #1866 Dial Glass Extrusion Glass End Cap Lower Panel Extrusion Upper Panel Extrusion Fuse -- 3.2 Amp Slo-Blo Tuning Meter Tone Control Module Rumble and HF Module 058-006 058-014 016-052 016-053 018-080 018-094 018-095 089-006 124-006 130-007 130-025 Knob (¼ " without index) Tuning Knob (11/8 " with index) Volume, Selector , Balance Knob (11/8 " with index) Bass, Treble Knob (¾" with index) Bass, Treble 043-479 043-480 090-070 090-071
14
MAC V 15 V 14 V13
1500
TOP
and
BOTTOM
VIEWS
BIAS ADJUST CONTROLS
V12
V3
V4
OUTPUT TRANSFORMERS LEFT RIGHT
V10
POWER TRANSFORMER
V9
OSCILLATOR
V11
COIL TRIMMER
V2
MIXER COIL TRIMMER 6EA8 (V7) LEFT AND RIGHT PRE AMP PRINTED CIRCUIT BOARDS TRIMMER COIL 12AU7 (V8)
RF
V1
ANTENNA COIL
TUNING CONDENSER COVER
V4
MUTE ADJUST CONTROL
V12
V13
V14 V15
3RD IF TRANSFORMER
4TH IF TRANSFORMER
V5 Q3 Q4 Q2
2.2K
2ND IF TRANSFORMER
V6
DISCRIMINATOR TRANSFORMER 1ST IF TRANSFORMER
19KC
PHASE COIL
Q7 Q5 Q8 Q6
INJECT 10.7 MC SIGNAL HERE
MPX INPUT (WHITE WIRE; 19 KC TRANSFORMER
LOW PASS FILTER ANTENNA COIL 67 KC FILTER 38 KC TRANSFORMER RF COIL MIXER COIL
15
SPECIFICATIONS
FM TUNER SECTION: USABLE SENSITIVITY lot 100% modulation): 2.5uV (I.H.F. Standards) SIGNAL TO NOISE AND HUM RATIO: 65db. HARMONIC DISTORTION: Mono, less than .5% Stereo, less than .8% DRIFT: less than 25KC FREQUENCY RESPONSE: Flat from 20 cps to 20KC with standard 75 µ second deemphasis and 19KC pilot frequency filter. CAPTURE RATIO: Better than 2.0db. IMAGE REJECTION: Better than 60db. STEREO MULTIPLEX SEPARATION: Better than 30db at 1 KC. SPECIAL FEATURES: a) Automatic stereo switching. b) Muting: IF Injected circuit with at least 50db quieting between stations. c) Antenna inputs for 300 ohm balanced (for twin lead) and 75 ohm unbalanced (for coaxial cable). d) Nuvistor RF amplifier, Nuvistor mixer. e] Four stages of IF amplification, with AGC used to insure that limiting occurs only in the limiter stages. f) Two limiter stages used for exceptional capture ratio and smooth muting operation. g) Multiplex filter and SCA filter, to suppress 19KC and 38KC signal components at least 40db below program and to suppress 67KC SCA by 60db. h) Noise immune logic circuit used to activate MPX stereo light and automatic stereo switching on 19KC stereo pilot only. i) D'Arsonval tuning meter lor accurate center of channel tuning. i) Flywheel tuning for ease of operation and precise tuning. HARMONIC DISTORTION: less than 0.5% 30 cps to 20KC, both channels operating at rated output at the same time. INTERMODULATION DISTORTION: Less than 0.5% for any combination of frequencies from 30 cps to 20KC at rated output (equivalent RMS watts). I.M. decreases as output power is reduced. FREQUENCY RESPONSE: ±0.5db 20 cps to 20KC. (Power amplifier response is 2 cps to 150KC at -- 3db; power bandwidth is 19 cps to 30KC.) OUTPUT IMPEDANCE: 4, 8, and 16 ohms. Rated output is delivered by any of these impedances. DAMPING FACTOR: Greater than 1 0. INPUT SENSITIVITY AND IMPEDANCE: Tape Head--2.8MV, 1 megohm Phono 1 --5.6MV, 47K ohms Phono 2-2.8MV, 47K ohms Aux--400MV, 500K ohms Tape Monilor-400MV, 500K ohms TAPE OUTPUT LEVEL: Tuner-1.2 volts, for other Inputs 400MV at rated sensitivity. HUM AND NOISE: Power Amplifier, -- 90db High Level Inputs, - 75db Low Level Inputs, --60db TONE CONTROL RANGE: Bass control + 1 5db to - 1 8db at 50 cps. Treble control + 1 5db to - 1 5 db at 10KC. L.F. and H.F. FILTER: L.F. filter, cutoff frequency = 50 cps, attenuation rate -- 1 2db per octave AMPLIFIER SECTION: POWER OUTPUT: 60 watts continuous, 30 watts per channel, 65 watts total music power (I.H.F. Standards). H.F. Filler, cutoff frequency = 5KC. attenuation rale = 1 2db per octave SPECIAL FEATURES: a) Loudness control for full fidelity listening levels. b) Tape monitor switch for listening to recorded tope program white recording. c) Tone controls are "clutched" for tracking operation of left and right channels or independent operation. d) Headphone output fed from special tap on output transformer for maximum signal to noise ratio. Speakers may be automatically muted when headphone plug is inserted, by use of rear mounted switch. e) Silicon transistors used in all preamplifier stages for low noise and hum free operation. f) High quality epoxy circuit boards for reliable long life performance. g) High quality conservatively operated components ore used throughout for long life. h) Zener regulated power supply is used for critical circuits. i) Equalization and tone control circuits are feedback type for lowest distortion and greatest accuracy. MISCELLANEOUS FINISH: Gold anodized panel and knobs, black finished chassis. DIMENSIONS: 16" wide, 5½" high, 16" deep. WEIGHT: 40 lbs., shipping weight 54 Ibs. POWER CONSUMPTION: 180 watts, 120 volts, 60 cps. TRANSISTOR AND TUBE COMPLEMENT: 19 silicon transistors 1 germanium transistor 15 tubes 1 6 diodes, rectifier, and zener diode
BLOCK DIAGRAM
16
MAC 1500 STEREO RECEIVER BLOCK DIAGRAM
MclNTOSH AUDIO COMPANY
2 Chambers St., Binghamton, N.Y. 13903
Made In U.S.A. Phong--Area Code 607-723-5491 Design subject to change without notice.
038-133 Printed in U.S.A.