This is another gorgeous early C20 preamp with a brass bar across the face, solid brass frame. One of the best tube preamps ever made. This one is full of Telefunken, Mullard, & McIntosh tubes - and no, they're not Russian repops.
- Production
- 1959-61
- Condition
- 9/10
- Serial No.
- 1L 748
- Orig. MSRP
- $269
- Restoration
- Full service check
- Cleaned controls and switches
- Replaced Electrolytic capacitor for the heater rectifiers
- Replaced bad diodes
- Factory Specs
FREQUENCY RESPONSE ±0.5db 20 to 20,000 cycles.
DISTORTION Less than 0.2% at 2.5V output, 20 to 20,000 cycles.
HUM AND NOISE High-level inputs: 85db below 2.5V. Low-level inputs: less than 2 microvolts at input terminals.
INPUT SENSITIVITY AND IMPEDANCE Auxiliary, Tape, Tuner 1, Tuner 2:0.25 volts 470,000 ohms. Tape Compare (Monitor): 0.25 volts 115,000 ohms. Phono 1, Phono 2, (Low): 2 to 10 millivolts 47,000 ohms. Phono 1, Phono 2, (High): 10 to 70 millivolts 47,000 ohms. Tape Head 1, Tape Head 2: 2-10 millivolts 47,000 ohms. Xtal-Ceramic Phono 1, Xtal-Ceramic Phono 2:0.1 volt (220 mmf in series with 47,000 ohms).
OUTPUTS Main (2 jacks on each channel): 2.5V with rated input. Tape: 0.25V with rated input. Left plus Right: 2.5V from source impedance of 23,000 ohms.
VOLTAGE AMPLIFICATION Low Level Inputs to Main Output: 60db (1000 to 1)@ 1000 cycles. Low Level Inputs to Tape Output: 40db (100 to 1)@ 1000 cycles. High Level Inputs to Tape Output: 0db (1 to 1). Tape Monitor Input to Main Output: 20db (10 to1).
AUXILIARY AC OUTLETS (5) 1 unswitched for turntable (Red), 4 switched (Black).
POWER REQUIREMENTS 35 watts @ 117V 60 cycles AC
- The History of McIntosh
- Founded in 1949, McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment...
[ Read More ]
- Liner Notes
- The C20 Stereo Preamplifier is unmatched in flexibility of operation for all stereophonic and monophonic program sources. 30 combinations of record compensation perfectly match current stereo records as well as valuable monophonic records. The tape compare switch allows instant "off-tape" comparison of the program with the recording. An additional tape recorder may be conveniently connected to the C20 through front panel tape jacks for tape copying, recording, or playback. The C20 continuously variable loudness control automatically compensates for hearing characteristics as it lowers the volume. Full bass and treble balance are maintained at even the softest listening levels. The Mclntosh C20 has been selected by thousands of music lovers and discriminating professionals, as the performance standard of the industry for more than 5 years.
- Stock No.
- 6283364073640
This is another gorgeous early C20 preamp with a brass bar across the face, solid brass frame. One of the best tube preamps ever made. This one is full of Telefunken, Mullard, & McIntosh tubes - and no, they're not Russian repops.
Production
1959-61
Condition
9/10
Serial No.
1L 748
Orig. MSRP
$269
Restoration
- Full service check
- Cleaned controls and switches
- Replaced Electrolytic capacitor for the heater rectifiers
- Replaced bad diodes
Factory Specs
FREQUENCY RESPONSE ±0.5db 20 to 20,000 cycles.
DISTORTION Less than 0.2% at 2.5V output, 20 to 20,000 cycles.
HUM AND NOISE High-level inputs: 85db below 2.5V. Low-level inputs: less than 2 microvolts at input terminals.
INPUT SENSITIVITY AND IMPEDANCE Auxiliary, Tape, Tuner 1, Tuner 2:0.25 volts 470,000 ohms. Tape Compare (Monitor): 0.25 volts 115,000 ohms. Phono 1, Phono 2, (Low): 2 to 10 millivolts 47,000 ohms. Phono 1, Phono 2, (High): 10 to 70 millivolts 47,000 ohms. Tape Head 1, Tape Head 2: 2-10 millivolts 47,000 ohms. Xtal-Ceramic Phono 1, Xtal-Ceramic Phono 2:0.1 volt (220 mmf in series with 47,000 ohms).
OUTPUTS Main (2 jacks on each channel): 2.5V with rated input. Tape: 0.25V with rated input. Left plus Right: 2.5V from source impedance of 23,000 ohms.
VOLTAGE AMPLIFICATION Low Level Inputs to Main Output: 60db (1000 to 1)@ 1000 cycles. Low Level Inputs to Tape Output: 40db (100 to 1)@ 1000 cycles. High Level Inputs to Tape Output: 0db (1 to 1). Tape Monitor Input to Main Output: 20db (10 to1).
AUXILIARY AC OUTLETS (5) 1 unswitched for turntable (Red), 4 switched (Black).
POWER REQUIREMENTS 35 watts @ 117V 60 cycles AC
The History of McIntosh
Founded in 1949, McIntosh is known for offering distinguished home audio systems that deliver the ultimate experience in music and film. Offering products for two-channel stereo sound systems and multi-channel home theaters with surround sound, McIntosh continues to define the ultimate home audio entertainment...
[ Read More ]
Liner Notes
The C20 Stereo Preamplifier is unmatched in flexibility of operation for all stereophonic and monophonic program sources. 30 combinations of record compensation perfectly match current stereo records as well as valuable monophonic records. The tape compare switch allows instant "off-tape" comparison of the program with the recording. An additional tape recorder may be conveniently connected to the C20 through front panel tape jacks for tape copying, recording, or playback. The C20 continuously variable loudness control automatically compensates for hearing characteristics as it lowers the volume. Full bass and treble balance are maintained at even the softest listening levels. The Mclntosh C20 has been selected by thousands of music lovers and discriminating professionals, as the performance standard of the industry for more than 5 years.
Stock No.
6283364073640
