McIntosh MA 230 - SERVICS BULLETINS, Руководство пользователя

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Frequency Range
At 30 watts output both channels.
+ 0, -0.5db 20 cycles through 20,000
cycles.
+0, - 3 d b 15 cycles through 70,000
cycles.
Output Impedance
4 ohms, 8 ohms, 16 ohms.
Internal Impedance/Damping
Less than 10% of rated load impedance;
damping factory of 10.
Input Sensitivity and Impedance
Auxiliary, Tape, Tuner, and Tape Monitor:
.25 volts, 250K ohms.
Phono 1 and Phono 2: 1.5 millivolts, 47,000
ohms.
Tape Head: 1.5 millivolts, 1 Megohm.
Total Noise (including Power Amplifier)
High level inputs: 75db below rated output.
Low level inputs: 60db below rated output;
less than 4.0 microvolts at input terminals.
Tape Output
.25 volts into 25,000 ohms with rated input;
1.6 volts with 10 millivolts at Phono input.
Left Plus Right Output
10 volts from generator impedance of 5,000
ohms.
Bass Controls
±18db at 20 cycles, with friction clutch for
independent adjustment of each channel.
Treble Controls
± 18db at 20,000 cycles, with friction clutch
for independent adjustment of each channel.
Comp (Compensator) Switch
RIAA or LP phono equalization.
Tape Switch
Normal or Tape Monitor.
Phase Switch
Normal (0°) or reverse (180°).
Speaker Switch
Speakers ON, or OFF for headphone listening.
HF Filter
Flat, or 5,000 cycle cutoff, 12db per octave.
LF Filter
Flat, or 50 cycle cutoff, 12db per octave.
Loudness Switch
Normal or compensated bass and treble.
Headphone Jacks
Two, for two pairs of headphones.
Input Selector
6 positions: AUX, TAPE, TUNER, PHONO 1,
PHONO 2, TAPE HD.
Mode Selector
7 positions: L to L and R, R to L and R,
STEREO REVERSE, STEREO, MONO (L+R),
L+R to L, L+R to R.
Transistor Complement (Preamplifier)
8-2N2926 Silicon Planar
4-11BQ101 Silicon Planar
Tube Complement (Power Amplifier)
4 - 7 5 9 1 Power Output
2-12AU7 Driver/Phase Inverter
1-12AX7 1st Audio Voltage Amplifier
Power Requirements
120-125 volts AC, 60 cycles. 150 watts at
zero signal output; 210 watts at rated output.
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