SANSUI AU-11000
¥ 180,000 (released in 1975)
Commentary
This is a stereo pre-main amplifier developed by combining the audio technology developed by SANSUI over many years.
All stages are directly connected and pure complimentary service OCL system with a differential-amplifier circuit at the first stage of the power amplifier section, and parallel push-pull circuit with paired transistors with uniform characteristics at the outputs stage.
The equalizer amplifier section has a two amplifier configuration with a differential input circuit using dual transistors.
The entire band is divided into high and low bands, each of which is corrected by CR and NF bands to obtain RIAA curve characteristics with little error up to the ultra-high band.
A dynamic margin of 300 mv has also been achieved by supplying ± 2 high-voltage power supplies.
It is equipped with a unique triple tone control that adds a middle range to the tone control.
It also has a tone selector that allows you to switch between the low and high turnover frequencies.
The power transformer uses an efficient toroidal transformer with less magnetic flux leakage.
Together with a stable power supply that is strong against load fluctuations during peak hours, etc., it provides a stable power supply to each block stage.
It has a built-in protection circuit to protect the speakers and power transistors, detects abnormal temperature at the output stage and detects direct current at the output terminal using a combination of an electronic circuit and relay, and is equipped with an ASO detection current limiter circuit.
The chassis mechanism has been thoroughly examined. The functions related to operation such as the preamplifier and tone control are placed on the front panel side, and the power and power supply are placed on the rear side. Each block stage is completely separated and a single amplifier is integrated.
As a result, the input signal from the side panel input terminal flows to the preamplifier, tone control section and power amplifier section in the shortest distance, and there is no unnecessary interference. This improves the characteristics and ensures stable operation.
Input impedance and input sensitivity can be switched to 3 levels according to the cartridge characteristics.
Equipped with a Tone defeat switch that passes through the tone circuit and provides flat frequency characteristics.
You can select a volume level set of 0 dB, -10dB, or -20dB.
Equipped with a two circuit tape play switch and tape copy switch.
Equipped with low / high filter, tuner priority selector, muting switch and side input / output terminal.
Model Rating
| Type | Pre-main amplifier |
| Effective output (both channel operation) | 110W + 110W (4 ω, 8 ω, 20 Hz to 20 kHz) 110W + 110W (4 Ω, 8 Ω, 1 kHz, THD 0.05% or less) |
| Total harmonic distortion factor (rated output) | Not more than 0.08% |
| Intermodulation Distortion Factor (70 Hz : 7 kHz = 4 : 1, SMPTE) | Not more than 0.08% |
| Frequency Response (at 1W) | 10 Hz to 50 kHz + 0 -1dB |
| Damping factor | 80 (8 Ω) |
| RIAA deviation (30 Hz to 15 kHz) | ± 0.3 dB |
| Load impedance | 4 Ω, 8 Ω |
| Channel Separation (1 kHz) | Phono1 and 2 : 55 dB or more Tuner, Aux1, 2, Tape Monitor : 60 dB or higher |
| Hum and noise | Phono1, 2 : 65 dB or more Tuner, Aux1, 2, Tape Monitor : 80 dB or higher |
| Input Sensitivity / Impedance (1 kHz) | Phono1 : 2 mV, 4 mV, 8mV/30k Ω, 50k Ω, 100k Ω Phono2 : 2mV/50k Ω Tuner, Aux1, 2, Tape Monitor1 : 130mV/50k Ω Tape Monitor2(Pin/Din):130mV |
| Maximum allowable input (1 kHz, THD 0.1% or less) | Phono1 : 1000 mV (Input Sensitivity Switching 8 mV) Phono2:300mV Aux, Tuner : 3 v |
| Output level | Tape rec1(Pin):130mV Tape rec2(Pin/Din):130mV/30mV |
| Tone control | Bass : ± 10 dB (30 Hz) Midrange : ± 5 dB (1.5 kHz) Treble : ± 10 dB (20 kHz) |
| Tone selector | Bass : 150 Hz, 300 Hz, 600 Hz Treble : 2 kHz, 4 kHz, 8 kHz |
| Low filter | -3dB at 20 Hz, 12dB/oct. -3dB at 60 Hz, 12dB/oct. |
| High filter | -3dB (7 kHz), 6dB/oct. -3dB at 12 kHz, 12dB/oct. |
| Rated power consumption | 240W |
| External dimensions | Width 460x Height 160x Depth 375 mm |
| Weight | 19.3kg |