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McIntosh Model C-20

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Technic details

Specifications

Type:
Stereo Pre Amplifier
Frequency Response:
20Hz to 20kHz, ±0.5db
Distortion:
Less than 0.2% at rated output (20Hz to 20kHz)
Hum and Noise:
High-level inputs - 85db below rated output
Low-level inputs - Less than 2µV at input terminals

[Input Sensitivity / Impedance]
AUX:
0.25V / 470kΩ
Tape:
0.25V / 470kΩ
Tuner 1:
0.25V / 470kΩ
Tuner 2:
0.25V / 470kΩ
Phono 1:
2 to 10mV / 47kΩ for low output cartridge
10 to 70mV / 47kΩ for hi output cartridge
0.1V 220 mmf in series with 47kΩ for Xtal or Ceramic
Phono 2:
Same as phono 1
Tape Head 1:
2 to 10mV / 47kΩ for low output head
Tape Head 2:
Same as tape head 1
Tape Compare (Monitor):
0.25V / 115kΩ
Main Output:
2.5V with rated input
2 output jacks in parallel for each channel
Tape Output:
0.25V with rated input
1 output jack for each channel
Left plus right output:
2.5V from source impedance of 23kΩ
Voltage Amplification:
Low-level inputs to Main Output - 1000 to 1 (60db) at 1kHz
Low-level inputs to Tape Output - 100 to 1 (40db) at 1kHz
High-level inputs to Main Output - 10 to 1 (20db)
High-level inputs to Tape Output - 1 to 1 (0db)
Tape Monitor input to Main Output - 10 to 1 (20db)
A.C. Aux. Outlets:
1 X Unswitched for tape machine or turntable, colored Red
4 x Switched, colored Black

Power Requirements:
AC 117V, 60Hz
Power Consumption:
35W
Dimensions (W x H x D):
397 x 130 x 325mm
Weight:
8.16kg
Year:
1962

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