SANSUI SEVEN
¥ 126,000 (around 1972)
Commentary
This is a stereo receiver made by SANSUI with the aim of becoming a famous sound device by gathering all of its technologies.
In the main amplifier section, all stages are directly connected OCL pure complimentary service and a constant current drive system is adopted to prevent degradation of distortion characteristics at high and low outputs.
As a result, it is possible to achieve high-quality sound quality from deep bass to high pitch with little distortion, regardless of whether the sound is large or small.
The equalizer circuit of the preamp section uses an NF type with three stages of carefully selected low-noise transistors directly connected to each other to obtain excellent transient response and RIAA deviation.
In addition, the tone circuit is rotary switch type and can freely adjust low, middle and high frequencies with SANSUI's unique triple tone control.
The tuner and preamplifier are equipped with a stabilizing power supply that stabilizes the voltage, and the main amplifier is equipped with a constant current drive system and a two stage differential amplifier circuit that is stable against power and load fluctuations.
To protect the transistors and speakers, a newly designed relay circuit and four short-cut fuses are installed to ensure safety.
Equipped with a 4-channel adapter terminal that allows you to enjoy 4-channel stereo.
If you don't use this feature, you can connect a tape deck to record, play, and reprint your tapes.
You can connect a noise reduction adapter that reduces the noise unique to tape and allows you to enjoy comfortable recording and playback.
The pre-amplifier and main amplifier sections can be used separately and can be developed into a multi-amplifier system.
Equipped with low filter, high filter, loudness switch, mode switch which can switch between stereo and monaural, etc.
Three pairs of speakers can be connected and the selector can be used to select A, B, C, A + B, A + C, or OFF.
In order to receive with minimum distortion and maximum S/N, we have adopted a 2-meter system consisting of a signal meter with a precise tuning point and a center tuning meter.
A muting circuit is built in to cut off inter-station noise.
It is also possible to select a station with weak signal by switching the switch.
In addition to the normal balanced 300 ohm antenna input terminal, there is also a 75 ohm terminal for coaxial cable, which is effective for long distances and noisy locations.
Model Rating
| Type | FM/AM Receiver | ||||
| FM Tuner Section | |||||
| Receiving frequency | 76 MHz to 90 MHz | ||||
| Sensitivity (IHF) | 1.8 μ V | ||||
| Total harmonic distortion factor | Stereo : not more than 0.5% | ||||
| Signal-to-noise ratio | 63 dB or more | ||||
| Selectivity | 60 dB or more | ||||
| Stereo separation | 40 dB or More (400 Hz) | ||||
| <AM Tuner Section> | |||||
| Receiving frequency | 535 kHz to 1605 kHz | ||||
| Sensitivity (bar antenna) | 46dB/m | ||||
| Amplifier Unit | |||||
| Rated output |
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| Total harmonic distortion factor | 0.3% or Less (Rated Output, Main Amplifier) | ||||
| Cross modulation distortion factor | 0.3% or Less (Rated Output, SMPTE, 70 hz : 7 khz = 4 : 1, Main Amplifier) | ||||
| Power Band With (IHF) | 10 Hz ~ 50 kHz (8 Ω) | ||||
| Frequency response (main amplifier) | 15 Hz to 40 kHz, ± 1 dB | ||||
| Hum and noise | 90 dB or more (IHF, main amplifier) | ||||
| Input Sensitivity / Impedance (1kHz) |
Phono (maximum allowable input 100 mV, THD 0.5% or less) : 2.5mV/50k Ω AUX, Tape Monitor, 4 ch Adaptor : 150mV/50k Ω Main Amp : 800mV/50k Ω |
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| Output voltage | Tape Monitor(Din):30mV (Phone, Pin) : 150 mv |
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| Tone control | Bass (3 dB step) : ± 15 dB (20 Hz) Midrange (1 dB step) : ± 5 dB (1.5 kHz) Treble (3 dB step) : ± 15 dB (20 kHz) Loudness : + 10 dB (50 Hz), + 8 dB (10 kHz) Low Filter : -10dB (50 Hz, 12dB/oct) High Filter : -10dB (10 kHz, 12dB/oct) |
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| <General> | |||||
| External dimensions | Width 440x Height 140x Depth 328 mm | ||||
| Weight | 14.3kg | ||||