Page 1
PERFORMANCE SPECIFICATIONS
2
1. The heavy lines on the schematic denote the primary
signal path.
2. Unless otherwise noted, all voltages indicated on the
schematics are measured under the following conditions:
a. AC input at 120 volts, 50/60Hz.
b. All voltages are +/-10% with respect to ground. A
high impedance (10 megaohm) voltmeter must be used.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).4. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
5.WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.
NOTES
Power Output
Minimum sine wave continuous average power output per
channel, all channels operating is:
200 watts into 2 ohm load
200 watts into 4 ohm load
200 watts into 8 ohm load
Rated Power Band
20Hz to 20,000Hz
Total Harmonic Distortion
Maximum Total Harmonic Distortion at any power level
from 250 milliwatts to rated power output is:
0.005% for 2, 4 or 8 ohm loads
Dynamic Headroom
2.4dB
Frequency Response
+0, -0.5dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Sensitivity
Phono, 2.5mV for 2.5V rated output (0.5mV IHF)
High Level, 250mV for 2.5V rated output (50mV IHF)
Power Amplifier Input, 2.5V for rated output
Signal To Noise Ratio (A Weighted)
90dB (84dB IHF) below 10mV input, Phono Input
100dB (90dB IHF) below rated output, High Level
110dB below rated output, Power Amplifier
Intermodulation Distortion
Maximum Intermodulation Distortion if instantaneous peak
output per channel does not exceed twice the rated output,
for any combination of frequencies from 20Hz to 20,000Hz,
with all channels operating is:
0.005% for 2, 4 or 8 ohm loadsInput Impedance
Phono, 47k ohms, 65pF
High Level, 22k ohms
Maximum Input Signal
Phono, 90mV
High Level, 8V
Preamplifier Maximum Voltage Output
Phono, 8V at tape output
High Level, 8V at tape output
Main Out, 8V at preamp output
Voltage Gain
High Level to Tape: 0dB
High Level to Main: 20dB
Wide Band Damping Factor
Greater than 40
Power Requirements
100 Volts, ~ 50/60Hz at 4.8 amps
110 Volts, ~ 50/60Hz at 4.4 amps
120 Volts, ~ 50/60Hz at 4.2 amps
220 Volts, ~ 50/60Hz at 2.0 amps
230 Volts, ~ 50/60Hz at 2.0 amps
240 Volts, ~ 50/60Hz at 2.0 amps
Note: Refer to the rear panel of the MA6900 for the correct voltage.
Overall Dimensions
Front Panel: 17-1/2 inches (44.45cm) wide, 7-1/8 inches
(18.10cm) high. Depth behind front mounting panel is 16-1/2
inches (41.91cm). Clearance required in front of the Front Panel
is 1 inch (2.54cm) for knobs.
Weight
74.5 pounds (33.8 Kg) net, 92.5 pounds (41.7 Kg) in shipping
carton
