Audio Database

The

SANSUI AU-888
72,500yen(around the 1971 time)

Description
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The stereo Integrated Amplifier which had a performance near AU-999, and a functionality and adopted a new design.

The main-amplifier part has adopted the full hardwired connection by plus-or-minus 2 power source of a two-step differential-amplification circuitry and an output Capacitor-Less, and the complimentary darlington circuit scheme.
For this reason, equal NFB starts throughout an audio from a direct-current region, a dumping factor and an output characteristics become fixed to super-low-pass one, disorder by the super-low-pass one of a speaker decreases, and cross modulation distortion is reduced.

From the NPN silicon transistor, a preamplifier part essentially uses a PNP silicon transistor with few noises, and is reducing the noise.

A hardwired-connection circuitry is adopted as much as possible, a capacitor is lessened, in the required fraction, a circuit impedance is made high, a Mylar type is used, and the electric-field capacitor is reduced as much as possible.
Moreover, the electric-field capacitor used the Mylar type for the surely required fraction in parallel, and has improved the high region property.

The exclusive transistor and the differential-amplifier stabilization circuitry which makes the two-step differential amplifier stabilize the differential amplifier are adopted as temperature compensation. Moreover, it is the protection network which adopted six immediate judgment fuses.
And when a power transistor is damaged, abnormal voltage occurs, the speaker protection network by SCR is carried so that a direct current may not flow into a speaker, and a speaker is protected even in an emergency.

T.T.C (triple tone control) of Bass, Midrange, and Treble is carried.
Thereby, the special NetWare program and the more exact correction of the room acoustic are attained.

It is a location of a speaker switching C system, and is a preamplifier so that a multi-amplifier scheme can be built harnessing the performance of a preamplifier part and a main-amplifier part. A main amplifier can use it independently, respectively.

The tone selector with which an elevation and a descending point can change a defeet to two frequencies was carried in Midrange, and the correction of the mid range became more exact.

The independent ripple-filter circuitry is carried in +, - power source, and the preamplifier power source of a main amplifier, and a hum component is intercepted to them, and they are made to stabilize a power source.

Functionalities, such as a low filter, a high filter, a loudness, a headset jack, and a muting switch, are carried.


Rating of a mode
Form Stereo Integrated Amplifier
<Main-amplifier part>
Output power
Music power (IHF) : 140W (4ohm)
100W (8ohm)
Effective output : 50/50W (4ohm)
45/45W (8ohm)
THD 0.4% or less (Output power)
Cross modulation distortion (SMPTE, 60Hz:7kHz=4:1) 0.4% or less (Output power)
Power Band Width (IHF) 10Hz - 40,000Hz (8ohm)
Frequency characteristic 10Hz - 70,000Hz, }1dB
Channel separation 50dB or more (1kHz, Output power)
A hum and a noise (IHF) 100dB or more
Input sensitivity/impedance (an Output power, 1kHz) 1V/50kohm
Dumping factor 20 (8-ohm load intensity)
Load impedance 4ohm-16ohm
<Preamplifier part>
Output voltage Maximum output voltage: 4V
Output-power voltage: 1V
THD 0.1% (Output-power voltage)
Frequency characteristic 15Hz - 50,000Hz, and +0.5 -1.5 dB
Channel separation Phono:50dB
AUX:50dB
A hum and a noise (IHF) Phono1, 2:80dB or more
MIC: 80dB or more
Tuner, AUX: 85dB or more
Input sensitivity/impedance
(An Output-power voltage, 1kHz)
Phono1:2mV/50kohm
Phono2:2mV/30kohm, 50kohm, 100kohm
MIC: 2mV / 50kohm
Tuner: 180mV / 100kohm
AUX: 180mV / 100kohm
Tape Mon(Pin): 180mV / 100kohm
Tape Recorder(Din): 180mV / 50kohm
Sound-recording output Tape Rec(Pin):180mV
Tape Recorder(Din):30mV
Tone control Bass: 20Hz+12 -8 dB (2dB step)
Midrange: 1,000Hz, 2,000Hz}5dB (1dB step)
Treble: 20,000Hz+12 -8 dB (2dB step)
Tone selector Midrange:Defeat, 1,000Hz, 2,000Hz
Loudness: +8dB (50Hz), +3dB (10,000Hz)
Switchpoint A high filter: 10,000Hz-8dB (12 dB/oct, NF type)
A low filter: 50Hz-8dB (12 dB/oct, NF type)
Muting: -20dB
<Synthesis>
Supply voltage 100V, 50Hz/60Hz
Power consumption 400W (at the time of the maximum input)
Dimensions Width 460x height 140x depth of 305mm
Weight 12.6kg