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MA 6100
PREAMP AMPLIFIER
SERVICE INFORMATION
STARTING WITH S E R I A L NO. AE1001
MA 6100
MclNTOSH
LABORATORY
INC.
2
CHAMBERS
STREET
BINGHAMTON,
NEW Y O R K
MA 6 1 0 0
P E R F O R M A N C E LIMITS
PERFORMANCE Mclntosh audio power ratings are in accordance with the Federal Trade Commission Regulation of November 4, 1974 concerning power output claims for amplifiers used in home entertainment products. POWER OUTPUT
70 watts minimum sine wave continuous average power output, per channel, both channels operating into 8 ohms load impedance which is: 23.7 volts RMS across 8 ohms 40 watts minimum sine wave continuous average power output, per channel, both channels operating into 16 ohms load impedance which is: 25.3 volts RMS across 16 ohms
OUTPUT LOAD IMPEDANCE
RATINGS OUTPUT VOLTAGE At TAPE output: Aux, Tape, Tuner: 300 mV with input Phono: 300 mV with rated input; 1.2 volts with 1.0 mV input at 1000 Hz Tape Hd: 300 mV at 500 Hz with rated input DAMPING FACTOR 50 at 8 ohms output 100 at 16 ohms output INPUT SENSITIVITY AND IMPEDANCE Power Amplifier: 3 volts, 100,000 ohms Phono 1 and Phono 2: 2.5 mV at 1000 Hz, 47,000 ohms Tape Head: 3 mV, 47,000 ohms Tape, Aux, and Tuner: 300 mV, 250,000 ohms BASS CONTROLS + 16 dB to -16 dB at 20 Hz TREBLE CONTROLS + 16 dB to -16 dB at 20,000 Hz LF FILTER Active filter, 12 dB per octave rolloff below 50 Hz; 20 dB down at 20 Hz HF FILTER Active filter, 12 dB per octave rolloff above 7000 Hz; 20 dB down at 20,000 Hz GENERAL INFORMATION SEMICONDUCTOR COMPLEMENT 36 Silicon Transitors, 22 Silicon Rectifiers and Diodes, 2 Silicon Bilateral Switches, 2 Triac POWER REQUIREMENTS 120 Volts, 50/60 Hz, 50 watts at zero signal output, 380 watts at rated output MECHANICAL INFORMATION SIZE Front panel measures 16 inches wide (40.64 cm) by 5 7/16 inches high (13.81 cm). Chassis measures 15 inches wide (38.1 cm) by 13 inches deep (33.02 cm), including Panloc shelf and back panel connectors. Knob clearance required is 1½ (3.81 cm) in front of mounting panel WEIGHT 34 pounds (15.42 kg) net, 46 pounds (20.87 kg) in shipping carton
8 ohms or 16 ohms
RATED POWER BAND
20 Hz to 20,000 Hz
TOTAL HARMONIC DISTORTION
0.2% maximum harmonic distortion at any power level from 250 milliwatts to rated power per channel from 20 Hz to 20,000 Hz, both channels operating
INTERMODULATION DISTORTION 0.2% if instantaneous peak power output is twice rated continuous average power or less per channel with both channels operating for any combination of frequencies 20 Hz to 20,000 Hz FREQUENCY RESPONSE 20 Hz to 20,000 Hz +0 -0.5 dB at rated power NOISE AND HUM Power amplifier: 95 dB below rated output Aux, Tape, Tuner: 90 dB below rated output Phono Input, Tape Hd.: 76 dB below 10 mV input
MA6100 BLOCK DIAGRAM
MA 6 1 0 0
TONE & VOLUME CONTROL
NOTE 10
MA 6 1 0 0
PC B O A R D 0 4 4 - 5 1 4
LEFT CHANNEL
PREAMP PC BOARD 044-512
RIGHT CHANNEL
PREAMP PC BOARD 044-512
EQUALIZATION PC BOARD 044-420
PREAMP SECTION
MA 6100 154-632
MA 6 1 0 0
MA 6 1 0 0
POWER OUTPUT SECTION
MA6IOO 154-631
MA 6 1 0 0
LEFT CHANNEL POWER OUTPUT PC BOARD 0 4 4 - 4 8 0
RIGHT CHANNEL POWER OUTPUT PC BOARD 0 4 4 - 4 8 0
MA 6 1 0 0
REG & PHASE INVERTER PC B O A R D 0 4 4 - 4 1 9
Q417 Q415
TOP BOTTOM
Q418 Q416
TOP BOTTOM
LOCATION OF TRANSISTORS NOT ON PC BOARD
MA 6100
POWER SUPPLY SECTION
MA6IOO 154-616
MA
6100
SCHEMATIC NOTES
1. U n l e s s otherwise s p e c i f i e d : R e s i s t a n c e values are in ohms , 1/4 w a t t , and 10% tolerance; Capacitance v a l u e s smaller then 1 are in microfarads (µF); capacitance v a l u e s greater than 1 are in picofarads (pF); inductors are in m i c r o h e n r i e s ( µH) . 2. Printed c i r c u i t board components are o u t l i n e d on the schematics by dotted l i n e s . The c i r c l e d numbers around the dotted l i n e s correspond to the numbers on the PC Board layouts.
3 . The heavy l i n e s on the schematics denote the p r i m a r y s i g n a l p a t h . 4. The t e r m i n a l n u m b e r i n g of rotary switches is for reference o n l y . 5 . A l l voltages indicated on the schematics are measured under the fol1ow ing c o n d i t i o n s : a. Use of an 11 megohm i n p u t impedance VTVM.
b. A l l v o l t a g e s ±10% w i t h respect to c h a s s i s ground. c. d. e. No s i g n a l at i n p u t t e r m i n a l s . AC i n p u t at 120 v o l t s , 50/60 Hz. Front panel controls a t : Volume I n p u t selector Mode selector B a l a n c e control Como 6. 7. 8. 9. 10. F u l 1 y CW Aux Stereo Zero Flat Tape mon. Tape copy Filters Phase Speakers out out out out out
Tone controls Flat In u n i t s w i t h S e r i a l No's below A E 1 4 5 3 ; C415 & C416 are 1000pF. C413 & C414 are 1000µF and C407 & C408 are 470pF. In e a r l y export u n i t s R429, R430, R447 & R448 are 47 In u n i t s w i t h S e r i a l No's below AE2557; C I 1 7 and C 1 1 8 are 1 2 p F . In u n i t s w i t h S e r i a l No's below AE2075; R309 is D308. Part No. 070-064) (Mclntosh
In u n i t s w i t h S e r i a l No's below A E 2 1 2 2 ; R211 & R 2 1 2 are Mclntosh Part No. 134-354 and R227 & R228 are M c l n t o s h Part No. 134-253.
1 1 . I n u n i t s w i t h Serial No's below AE3988; R 4 2 1 , R422, R423 & R 4 2 4 are 100 5% 1/2W; R425, R426, R427, & R428 are used; D 4 1 7 , D 4 1 8 , D419 & D420 are not used; R437 and R438 are used and D 4 I 5 and D 4 1 6 are not used.
MA
D417,418 D419,420 0308 D309
D401 , 4 0 2
6100
REPLACEMENT PARTS
A l l p a r t s not l i s t e d are common a b l e from r a d i o p a r t s j o b b e r s . items obtain-
Si. Rectifier
Si. Si.
Rectifier Rectifier
070-046 070-046 070-031 20V 070-064 070-047 070-046 070-047 070-047 070-031 070-031 132-098 070-047
R e p l a c e m e n t p a r t s may be o b t a i n e d when ordered by PART NUMBER f r o m : Mclntosh Laboratory, Inc. C us tomer S e r v i c e D e p a r t m e n t 2 Chambers S t r e e t Binghamton, New Y o r k 1 3 9 0 3 ( telephone 6 0 7 - 7 2 3 - 3 5 1 2 ) CAPACITORS Symbol Number
C 1 0 1 , 102
Zener
Si. Si. Si. Si. Si. Si.
Rectifier Rectifier Rectifier Rectifier Rectifier Rectifier
D403,404 D405,406 D407,408 Part Number D409,410
D411 , 4 1 2
Description Mylar . 47µF 250V
63V 63V
064-069 066-221 066-178 064-069 066-226 064-067
D413,414 D415,416
Ge. PNP T r a n s i s t o r
Si.
Rectifier
C105, 106 C107,108
C111 , 112
Ta. E l e c t 10µF T a . E l e c t 10µF Mylar . 4µF
FUSES
F401 , 4 0 2
250V
16V
Fuse Fuse
5A 5A 4A
089-014 089-014 088-007
C113, 114 C115,116 C119, 120 C123, 124 C125,126 C127, 128 C 1 2 9 , 130
C I 3 1 ,132
T a . Elect- 100µF Mylar Mylar Ta. E l e c t Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Ta. Elect Elect. Mylar Mylar Elect. Elect . Elect. Elect. Elect. Elect. Elect. . 1 µF . 22 µF 100µF .22µF . 1 µF .022µF .01µF .47µF .22µF .01µF .022µF . 47µF 10µF 33µF .22µF 1µF 100µF
F403,404 CB301
C i r c u i t B reaker CHOKES
250V
16V
064-068 066-226 064-068 064-067
Q 1 0 1 , 102 L401,402
Choke
4µH TRANSISTORS
122-105
250V
S i . PNP t r a n s i s t o r S i . PNP t r a n s i s t o r S i . NPN t r a n s i s t o r S i . NPN t r a n s i s t o r S i . NPN t r a n s i s t o r S i . NPN t r a n s i s t o r S i . NPN t r a n s i s t o r S i . NPN t r a n s i s tor S I . NPN t rans i s tor S i . PNP t r a n s i s t o r S i . NPN t r a n s i s t o r S i . PNP t r a n s i s t o r S i . PNP t r a n s i s t o r S i . NPN t rans i s t o r S i . NPN t r a n s i s t o r S i . PNP t rans i s t o r S i . NPN t r a n s i s t o r Si . PNP t r a n s i s t o r S i . NPN t rans i s t o r S i . NPN t r a n s i s t o r POTENTIOMETERS
132-096 132-096 132-095 132-093 132-093 132-093 132-095 132-095 132-094 132-096 132-078 132-056 132-056 132-081 132-021 132-032 132-080 132-079 132-128 132-128
250V 250V 250V 250V 250V 250V 250V
63V 40V
064-102 064-040 064-069 064-068 064-040 064-102 064-069 066-221 066-204 064-096
Q 1 0 3 , 104
Q 1 0 5 , 106 Q 1 0 7 , 108 QI09, 110
Ql11 ,112
C137,138
C201 ,202
C209.210
C212 ,213 C301
Ql13, 114 Q115, 116
Q301
C302 C303 C305 C306 C307
C312
Q302 Q303
Q 4 0 1 ,402
250V
40V
064-088 066-206 066-191 066-162
Q403 ,404 Q405,406 Q407,408
80/150/150/200µF 200/200/150/100V 9300µF 220µF 150µF 470µF 10µF
50V 100V 63V
C313,314
C317 C 4 0 1 ,402
Q409,410 066-201
Q411 , 4 1 2
066-?05 066-136
C403,404 C419,420 C427,428
Q413, 414 Q415,416
4V
35V 20V
066-173 066-158
Ta. Elect 1 . 5 µ F DIODES
Q417, 4 1 8
D301 ,302
R20I S i . R e c t i f i er S i . R e c t i f ier S i . R e c t i fier Zener
75V
Ba l ance con t ro l Vo 1 ume cont ro l B a s s t r i m con t ro l Bass t r i m control
134-240 134-239 134-354 134-254
070-041 R2IO 070-041
R21 1
D303,304 D305,306 D307
070-031 070-025
R212
POTENTIOMETERS
R215
R2I6 R227 R228
Treble control Bass control Treble t r i m control
134-238 134-237 134-253 134-253
Treble trim control
RESISTORS
R3I3
Wirewound 600 Wirewound 1 . 5K Wirewound 3 . 6K Wirewound . 33 Wirewound .33 SWITCHES
5W 5W 1 0W 5W 5W
139-043 139-079 139-047 139-080 139-080
R314 R401 ,402
R433,434 R435,436
SI S2 S3
Input selector switch Pushbutton s w i t c h Mode selector switch TRANSFORMERS
146-153 150-01 1 146-134
T30I
Power t rans former THYRISTORS & TRIGGERS
044-418
SBS401 ,402 B i l a t e r a l s w i t c h TR401 ,402 Triac FRONT PANEL & T R I M Front panel F ron t pane l end caps B a l a n c e control knob Comp cont ro l knob
131 -004
131-005
044-423 018-154 044-375 090-100 044-375 090-100 044-375
Bass knob ( f ron t ) Bass knob ( rea r ) T r e b l e knob ( f r o n t ) Treb le knob ( rear ) Vo l u me con t ro l knob Mode selector knob I n p u t selector knob LAMPS Pane l i l l urn i na t i on # 1 866 S w i t c h i n d i c a t o r #51 M O U N T I N G SYSTEM She l f bracket ( r i g h t ) S h e l f bracket ( l e f t ) Mount i ng temp l a te # 1 00 Hardwa re package M I S C E L L A N E O U S ITEMS P l a s t i c feet
Sh i pp i ng ca r ton
090- 100
044-372 044-372 044-372
058-014 058-021
043-622 043-623 038-179 043-608
01 7-156
044-510 038-61 1 170-021
BE042004 20C1025S7-M4810
Owners manua l L i ne cord
M A 6100 S C H E M A T I C P A R T N O . 0 3 8 - 8 1 0
MA 6100 S.B. No. 1
SERVICE BULLETIN
WIRING CHANGE
MODEL:
MA
6100
Preamp-Amplifier
PURPOSE O F M O D I F I C A T I O N : T o c o r r e c t w i r i n g error i n compensation and tone c o n t r o l s .
WHAT U N I T S A R E A F F E C T E D : Serial No. A E 1 0 0 1 to AE1184
WHEN M O D I F I C A T I O N SHOULD B E M A D E :
M c l N T O S H M O D I F I C A T I O N K I T NO.: PARTS R E Q U I R E D : None
Any t i m e any other s e r v i c e i s performed.
None
PROCEDURE:
(Refer to the d i a g r a m on reverse s i d e ) Remove d u s t cover, knobs & front p a n e l . I n t e r c h a n g e the orange and o r a n g e / w h i t e w i r e s connected to the tone c o n t r o l PC Board. I n t e r c h a n g e the brown and b r o w n / w h i t e w i r e s connected to the tone c o n t r o l PC Board. Remove 4 screws from upper s e c t i o n of sub p a n e l and i n t e r c h a n g e t h e green and g r e e n / w h i t e w i r e s connected to the v o l u m e c o n t r o l (R21O). R e p l a c e upper s e c t i o n of sub p a n e l m a k i n g sure to use t h e hex head screws in the top holes and the pan head screws in the lower holes . Rep l a c e f r o n t p a n e l , knobs and d u s t cover.
Step 1 Step 2 Step 3 Step 4
Step 5
BE042003 Mclntosh Laboratory Incorporated 2 Chambers Street Binghamton, New York 13903 Phone: Area Code 607-723-3512
TOP VIEW DUST COVER REMOVED ORANGE ORANGE-WHITE BROWN-WHITE BROWN STEP 3 STEP 2 TONE C O N T R O L PC B O A R D
UPPER SUB PANEL
VOLUME CONTROL R2IO
FRONT OF UNIT
MA 6100 S.B. No. 2
SERVICE BULLETIN
M O D I F I C A T I O N OF I N S T A L L A T I O N PROCEDURE
MODEL:
MA 6100 P r e a m p - A m p 1 i f i e r
PURPOSE OF M O D I F I C A T I O N : To prevent front panel g l a s s from b r e a k i n g when u n i t i s i n s t a l l e d . Screws s h i p p e d w i t h the u n i t can press a g a i n s t the back of the panel c a u s i n g g l a s s to break. WHAT U N I T S ARE AFFECTED: S e r i a l No. 7026 To 7439 Export
S e r i a l No. AE1001 To A E 1 1 3 7 Domestic Other u n i t s o u t s i d e of t h i s s e r i a l no. group are not affected.
WHEN M O D I F I C A T I O N SHOULD B E MADE: When u n i t s are b e i n g i n s t a l l e d e i t h e r i n the customers custom i n s t a l l a t i o n or our L 12 e q u i p m e n t c a b i n e t . PARTS R E Q U I R E D ; 4 #6-32 x 3/4 F l a t Head M a c h i n e Screws or 4 #6-32 x 1 - 1 / 4 F l a t Head M a c h i n e Screws
PROCEDURE: 1. For custom i n s t a l l a t i o n - Follow the n o r m a l mounting i n s t r u c t i o n s u s i n g the f l a t h e a d screws mentioned above rather than the f i l l i s t e r head screws that were s h i p p e d w i t h u n i t . 2. L 12 Cabinet I n s t a l l a t i o n - Follow the normal m o u n t i n g i n s t r u c t i o n s u s i n g the 6-32 x 3/4 f l a t head m a c h i n e screws m e n t i o n e d above rather than the f i l l i s t e r head screws that a r e enclosed w i t h each L 12 c a b i n e t .
Fillister Head
F l a t Head
038-682
BE042003 Mclntosh Laboratory Incorporated 2 Chambers Street Binghamton, New Y o r k 13903 Phone: Area Code 607-723-3512