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FROM S E R I A L NO.
10M01
TO
26M07
MC 2 1 0 5
MclNTOSH
LABORATORY
INC.
2
CHAMBERS STREET
BINGHAMTON,
NEW Y O R K
ELECTRICAL SPECIFICATIONS
POWER OUTPUT: 105 RMS watts continuous per channel into 4, 8, or 16 ohms both channels operating. HARMONIC DISTORTION:
Less than 0.25% at 105 watts power output from 20 Hz to 20 kHz, both channels operating. than 0.1% at rated power. is reduced. INTERMODULATION DISTORTION: Less than 0.25% if instantaneous peak power output is 210 watts or less per channel with both channels operating for any combination of frequencies 20 Hz to 20 kHz. FREQUENCY RANGE: 20 Hz to 20 kHz +0, -0.1 dB at rated power. 15 Hz to 60 kHz +0, -0.5 dB at rated power. 10 Hz to 100 kHz +0, -3.0 dB at rated power. NOISE AND HUM: 90 dB or more below rated output. OUTPUT IMPEDANCE: 4, 8, and 16 ohms OUTPUT VOLTAGES: 25 volts (connect to 8 ohm outputs.) DAMPING FACTOR: 18 at 4 ohms output 13 at 3 ohms output Typical performance is less
Distortion decreases as output
10 at 16 ohms output INPUT IMPEDANCE: 200,000 ohms INPUT SENSITIVITY: 0.5 volts. POWER Level control provided for higher input voltage.
REQUIREMENTS:
117 volts AC 50-60 Hz, 90 watts at zero signal output, 450 watts at rated output.
INPUT
SECTION PRINTED CIRCUIT BOARD
043-795
L O C A T I O N OF T R A N S I S T O R S NOT ON PRINTED CIRCUIT BOARDS
INPUT SECTION P R I N T E D CIRCUIT
BOARD
043-795
HEAVY
LINE
SHOWS P R I M A R Y SIGNAL PATH
INPUT SECTION
MC 2I05
154-292
LEFT CHANNEL POWER OUTPUT SECTION PRINTED CIRCUIT BOARD 043-805
RIGHT CHANNEL POWER OUTPUT SECTION PRINTED CIRCUIT BOARD 043-805
POWER OUTPUT SECTION
MC 2105
154- 366
METER SECTION PRINTED CIRCUIT BOARD
METER SECTION
MC 2105
154-294
SCHEMATIC NOTES 1. Unless otherwise specified: Resistance values are in ohms, 1/2 watt, and 10% tolerance; capacitance values smaller than 1 are in microfarads (µf) ; capacitance values greater than 1 are in picofarads ( p F ) ; inductors are in microhenries ( µ H ) . Printed circuit board components are outlined on the schematics by dotted lines. The circled numbers on the dotted lines correspond to the numbers on the PC board layouts. The heavy lines on the schematics denote the primary signal path. The terminal numbering of rotary switches is for reference only. All voltages indicated on the schematics are measured under the following conditions: a. b. c. Use of an 11 megohm impedance VTVM. All voltages ±10% with respect to chassis ground. Ho signal at input terminals.
2. I 3. 4. 5.
d. AC input at 117 volts AC, 50/60Hz. e. Front panel controls at: Left Gain Meter Range Right Gain Speakers Power FULLY CCW OFF FULLY CCW ON OH
6. R125, R126, R127, and R128 are 2.7K in early units. 7. R215 and R216 are 1.2K and R217 and R218 are 22K in early units. 8. In units with serial N o ' s below 10M40: C111, C112, C113, and C114, are used; C107, C108, C109. and C110 (part No. 064-044) are . 0 4 7 ; The emitter of Q113 and Q114 is connected as shown by the dotted line; R139 and Rl40 {part Ho. 139-061) are used. In units with serial N o ' s below 11M93: Rl59 and R160 are not used; R143, R144, R145, R146, R147, R 1 4 8 , R149, and R150 are .15W (part Ho. 139-055); pins Ho. 12 and 9 on PC boards are connected as shown by dotted line. C125 and C126 are used in units with serial No's from 11M93 to 13M05. R137f R138, R141, and Rl42 are 75ohm 9W 10% (part No. 139-070) and R119 and R120 are 2751 in early units. In units with serial No's below 20M01; R107, R108, C105, and C106 are used; ferrite beads (part No. 076-010) are not used. In units with serial No's below 20M50 R161 and R162 are not used and pin l4 is connected as shown by dotted line.
9.
10. 11. 12. 13.
14. R155 and R156 are 8.2ohm 10% in units with serial No's from l0M40 to 21M13. 15. 16. 17. 18. R109, 110 is 47K in units with serial No's from 11M93 to 23M25. In units with serial No' a below 10M40; C117 and Cll8 are .0012. No's from 10M40 to 23M25, C117 and Cll8 are not used. In units with serial No's below 23M25, C115 and C116 are .0012. Adjust meter calibration controls R213 (left channel) and R214 (right channel) so output meters indicate +3dB when meter range switch is in the "0" position and the amplifier is delivering 105 watts output. In units with aerial
METER SECTION PRINTED CIRCUIT BOARD 043-711
R E P L A C E M E N T PARTS
All parts not listed are common items obtainable from radio parts jobbers. Replacement parts may be obtained when ordered by PART NUMBER from: Mclntosh Laboratory Inc. Customer Service Department 2 Chambers Street Binghamton, Hew York 13903 (telephone 607-723-3512) CAPACITORS Symbol Number C1,2 C3,4 C5,6 C9,10 C11,12 C101,102 C121,122 C201,202 C203,204 C301 C302 C303 Mylar Mylar Elect. Elect. Elect. Elect. Elect. Mylar Elect. Description ,22uF .47uF 500uF l0uF 100uF 330uF 10uF ..47uF 100uF 250V 250V 16V 25V NP 15V 3V 50V 250V 3V Part Number 064-043 064-045 066-107 066-005 066-127
Q1,2 Q3,4 Q5,6
TRANSISTORS 132-054 132-054 132-031 132-031 132-031 132-515 132-021 132-032 132-038 132-039 132-518 132-541 132-518 132-541 132-517 132-541 132-517 132-541 132-517 132-542 132-517 132-542 132-054
Si. NPN transistor Si. NPN transistor Si. PNP transistor Si. PNP transistor Si. PNP transistor Si. NPN transistor Si. NPN transistor Si. PNP transistor Si. N P N transistor Si. PNP transistor Si. NPN transistor (Below Serial No. 20M01) Si. NPN transistor (Above Serial No. 20M01) Si. NPN transistor (Below Serial No. 20M01) Si. NPN transistor (Above Serial No. 20M01) Si. NPN transistor (Below Serial No. 20M01) Si. NPN transistor (Above Serial No. 20M01) Si. NPN transistor (Below Serial No. 20M01) Si. NPN transistor (Above Serial No. 20M01) Si. NPN transistor (Below Serial No. 20M01) Si. NPN transistor (Above Serial No. 20M01) Si. NPN transistor (Below Serial No. 20M01) Si. NPN transistor (Above Serial No. 20M01) Si. NPN transistor POTENTIOMETERS
Q101,102 Q103,104 Q105,106 Q107,108 Q109,110 Q111,112 Q113,114 Q115,116 Q115,116 Q117,118 Q117,118
066-105 066-113 064-045 066-047 066-119 066-119 066-095 Q123,124 Q123,124 070-022 070-040 070-022 070-022 070-003 070-003 043-903 043-904 070-031 070-031 R117,118 R137,138
R1, 2
Q119,120 Q119,120 Q121,122 Q121,122
Elect. 39,000uF 40V Elect. Elect. 39,000uF 40V
80/80/l50/50uF 200/200/150/150V
DIODES D101,102 D103,104 Dl05,106 D107,108 D201,202 D203,204 D301,302 D303,304 D305 D306 Si. signal diode Si. reference diode Si. signal diode Si. signal diode Ge. signal diode Ge. signal diode Rectifier Assy (Black) Rectifier Assy (Red) Si. rectifier Si. rectifier PUSES
Q125,126 Q125,126 Q201,202
Gain controls Meter calibration a d j u s t RESISTORS Wirewound Wirewound Wirewound Wirewound Wirewound Wirewound Wirewound Wirewound Thermistor 3.6K 5% 5W 5W 5W 5W 5W 5W 5W 5W
134-191 134-120
R213,2l4
139-065 139-061 139-061 139-071 139-071 139-071 139-071 139-071 144-012
.56 ohms .56 ohms .33 ohms .33 ohms . 33 ohms . 33 ohms .33 ohms
R141, 142
P301
Fuse
5 ampere Slo-Blo CHOKES
089-007
R143,144 R145,146 R147,148
L101,102
Choke METERS
75uH
122-013
R149,150 R159-160
M201,202
Meter (power level)
124-013
R301,302
SWITCHES
31
Input coupling switch Speaker switch Meter range switch Power on-off switch Thermal cut-out TRANSFORMERS
148-006 146-103 146-109 146-102 153-007
S101 S201 S301
S302,303
T0,0 1112
Output transformer Power transformer FRONT PANEL AND TRIM
043-649 043-693
T301
Front panel Front panel end caps Knobs (all controls ) LAMPS #1866 (for wording) #1888 (for meters) PANLOC SYSTEM Shelf bracket (right) Shelf bracket (left) Mounting template #300 Hardware package MISCELLANEOUS ITEMS Plastic feet Shipping carton Owners manual Line cord
043-735 018-112 043-253
058-014 058-029
043-678 043-679 038-161 043-691
017-041 043-793 038-163 170-021
5C01106S-M9321JG
SCHEMATIC PART NO. 0 3 8 - 3 2 1