McIntosh MA6300 User manual

SERVICE MANUAL
Performance Specifications ........................................ 2
Notes ......................................................................... 3
Rear Panel .................................................................. 4
Section Location ........................................................ 4
Block Diagram ...................................................... 5 - 6
Interconnection Diagram ...................................... 7 - 8
Main Schematic and PCB ..................................... 9 - 16
Preamp Schematic and PCB ............................... 17 - 20
Heatsink Schematic and PCB ............................ 21 - 28
Display Schematic and PCB .............................. 29 - 32
Push Button Schematic and PCB ....................... 33 - 34
Meter Schematic and PCB ................................. 35 - 36
Parts List ............................................................ 37 - 42
Repacking Instruction .............................................. 43
CONTENTS
INTEGRATED AMPLIFIER
SERIAL NO. WR1001 And Above

PERFORMANCE SPECIFICATIONS
2
PowerOutput
100 watts into an 8 ohm load is the minimum sine wave
continuous average power output. The output RMS
voltage is 28.3V across 8 ohms
160 watts into a 4 ohm load is the minimum sine wave
continuo us average power output. The output RMS
voltage is 25.3V across 4 ohms
OutputLoadImpedance
8 and 4 ohms
RatedPowerBand
20Hzto20,000Hz
Total HarmonicDistortion
0.005%maximumharmonicdistortionatanypowerlevel
from250milliwattstorated power,20Hz to 20,000Hz
DynamicHeadroom
1.4dB
Frequency Response
+0,-0.5dBfrom20Hzto20,000Hz
+0,-3dBfrom10Hzto 100,000Hz
PreamplifierMainOutput
1Vforratedinput(8VMaximun)
Sensitivity(for rated output)
HighLevel,250mVunbalanced,500mVbalanced
Phono,2.5mV
PowerAmpIn,1V
Signal To Noise Ratio(A-Weighted)
High Level, 97dB below rated output
Phono,90dBbelow10mVinput
PowerAmplifier, 110 below rated output
IntermodulationDistortion
0.005%maximum, if the instantaneous peak power
output is rated power or less per channel with both
channels operating for any combination of frequencies
from20Hzto20,000Hz.
WideBandDampingFactor
200 at 8 ohms
100 at 4 ohms
InputImpedance
HighLevel,20Kohms
Phono, 47K ohms; 65pF
PowerAmp In, 10K ohms
MaximumInputSignal
HighLevel,8V
Phono,90mV
PowerAmplifierIn, 8V
MainOutputImpedance
50ohms
PowerGuard
Less than 2% THD with up to 16dB overdrive at 1,000Hz
VoltageGain
High Level to Tape Output: 0dB
High Level to Main Output: 12dB
Phono to Main Output: 52dB
PowerRequirements
100Volts,50/60Hzat3.6amps
110Volts,50/60Hzat3.6 amps
120Volts,50/60Hzat3.2amps
220Volts,50/60Hzat1.8amps
230Volts,50/60Hzat1.8amps
240Volts,50/60Hzat1.8amps
Note: Refer to the rear panel of the MA6300 for the
correct voltage.
OverallDimensions
Widthis17-1/2inches(44.45cm)
Heightis 7-5/8 inches (19.37cm) including feet
Depth is 22 inches (55.88cm) including the Front Panel,
Knobs and Cables
Weight
37 pounds (16.8 kg) net, 55 pounds (24.9 kg) in shipping
carton
ShippingCartonDimensions
Widthis25inches(63.5cm)
Depthis 27 inches (68.6cm)
Heightis12inches(30.5cm)

3
MA6300
NOTES

4
MA6300
REAR PANEL
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED

INTEGRATEDAMPLIFIER
MA6300
BLOCK DIAGRAM
56

7 8
INTERCONNECT

INTEGRATEDAMPLIFIER
MA6300
910
2
MAIN 050276 SCH 1 OF 3

11 12
2 MAIN 050276 SCH 2 OF 3

INTEGRATEDAMPLIFIER
MA6300
13 14
2
MAIN 050276 SCH 3 OF 3

15 16
2
MAIN 050276 PCB

INTEGRATEDAMPLIFIER
MA6300
17 18
3
PREAMP 050279 SCH

19 20
3
PREAMP 050279 PCB

INTEGRATEDAMPLIFIER
MA6300
21 22
4
HEATSINK 050280 SCH 1 OF 3

23 24
4 HEATSINK 050280 SCH 2 OF 3

INTEGRATEDAMPLIFIER
MA6300
25 26
4
HEATSINK 050280 SCH 3 OF 3

27 28
4 HEATSINK 050280 PCB

INTEGRATEDAMPLIFIER
MA6300
29 30
5
DISPLAY 050277 SCH 1 of 2

31 32
5
DISPLAY 050277 SCH 2 of 2 and PCB

INTEGRATEDAMPLIFIER
MA6300
33 34
6
PUSH BUTTON 050278 SCH and PCB

35 36
7 METER 050351 SCH and PCB