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MARANTZ Model 7

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Technic details

Specifications

Type:
Tube bulb control amplifier
Rated output / maximum output (1kHz):
Pre out - 2V / 15V
Frequency characteristics:
20Hz to 20kHz, ±0.5dB
20Hz to 40kHz, ±1dB (FM • AM, FM (Multiplex), TV, Auxiliary, Tape-play)
20Hz to 20kHz, ±1dB (RIAA deviation)
Intermodulation distortionv (Typical measurements):
0.1% (10V equivalent peak RMS)
0.01 (2V equivalent peak RMS)
Gain:
64.5dB - (Phono 1, 2)
64.5dB - (Tape-Head)
62dB - (Microphone)
22.5dB - (High-level)
At recording output:
42dB - (Tape-Head)
40dB - (Microphone)
0dB - (High-level)
S / N ratio:
80dB (Phono 1, 2)
Input sensitivity / impedance:
1.4mV / 1MΩ - (Microphone)
1.2mV / 47kΩ - (Phono 1, 2)
2.5mV / 1MΩ - (Tape-Head)
140mV / 330kΩ - (FM • AM, FM (Multiplex), TV, Auxiliary, Tape-play)
Maximum allowable input (1 kHz):
Microphone - 140 mV
Phono 1, 2 - 140mV
Tape-Head - 300mV
Selector:
8 positions (Microphone, Phono 1, Phono 2, Tape-head, FM • AM, FM (Multiplex), TV, Auxiliary)
Mode:
5 positions (Stereo, Stereo Reverse, Channel A< Channel B, Channel A + B)
Filters:
High - (5kHz, 9kHz)
Rumble - (50Hz, 100Hz)
Tube complement:
6 x ECC83 / 12AX7
Power supply voltage:
AC 100V, 50 / 60Hz
Power consumption:
35W (Electrical Appliance and Material Control Law)
Optional:
Wood Case WC - 7 (¥ 25,000)
Outer dimensions (W x H x D):
452 x 171 x 260mm
Weight:
2kg
External dimensions (W x H x D):
391 x 155 x 261mm
Weight:
5kg
Year:
1958

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