Audio Database

The

SANSUI AU-777D
59,500yen(June, 1969 release)

Description
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The Integrated Amplifier which added the partial enhancement to AU-777, and did not modify circuitry, but was made to concentrate all the attempts on the quality of the sound itself, and was made to upgrade.

The main-amplifier part has adopted the semi- complimentary darlington circuit.

All the amplifying circuits from the first rank to the final output stage are constituted from NF amplifier, and the frequency characteristic, distortion, and S/N are improved. Moreover, the whole page consists of silicon transistors.

A preamplifier part and a main-amplifier part are separated and an independent using is possible respectively.

T.T.C. (triple tone control) which added Midrange to Bass and Treble is carried.
Thereby, a special NetWare program and a more exact correction of an acoustic are possible.

In order to make easy an exact coordination of a balance on either side, the stereo balance check circuitry is prepared.
If a switchpoint is pushed down on a testing, hearing the signal of a monophonic recording, when the balance is maintained normally, sound will be lost and an exact balance coordination can be performed simply.

The pure electronic PSC circuitry original with an SANSUI is adopted so that a power transistor may not be damaged, even if an output-terminal short-circuits accidentally.
Furthermore, the safeness is secured more combining an immediate judgment fuse in the power transistor.

Since the center channel output-terminal is carried and two circuitries of a flat output and a 159Hz high cut output are prepared, 3 dimension stereo can be enjoyed by connecting a Woofer with monophonic amplifier.

Since the power transistor was extended to the limit of the back panel of a 3mm aluminum extrusion and the heat-dissipation effect was raised, it has a margin also in a prolonged performance and can be equal to it.

Circuitries, such as a low filter, a high filter, a loudness, a tapes monitor circuitry, a headset jack, and a muting switch, are carried.


Rating of a mode
Form A solid-state/Integrated Amplifier
<Main-amplifier part>
Output power Music power (IHF): 70W}1dB (8ohm)
Effective output: 30W/30W}1dB (8ohm)
THD 0.5% or less
Cross modulation distortion (60Hz:7kHz=4:1) 0.8% or less
Power Band Width (IHF) 20Hz - 50000Hz (0.5% of distortion)
Frequency characteristic 20Hz - 100,000Hz, }1dB
Channel separation 20dB or more (1000Hz)
A hum and a noise (IHF) 100dB or more (closed circuit)
Input sensitivity/impedance 1V / 300kohm (an Output power, 1kHz)
Dumping factor 15 (8ohms)
Load impedance 4ohm-16ohm
Center channel Output voltage Flat output: 10V (1kHz)
High cut output (fo = 159Hz): 10V (50Hz)
<Preamplifier part>
Output voltage Maximum output voltage: 4V
Output-power voltage: 1V
THD 0.1% (Output-power voltage)
Frequency characteristic 20Hz - 70,000Hz, and +0.5 -1.5 dB
A hum and a noise (IHF, maximum output voltage) Phono1, 2:80dB or more (closed circuit)
MIC: 85dB or more (closed circuit)
Tuner: 85dB or more (open circuit)
AUX: 85dB or more (open circuit)
Input sensitivity/impedance
(An Output-power voltage, 1kHz)
Phono1:2mV}3dB /, 50kohm
Phono2:2mV}3dB /, 30kohm, 50kohm, 100kohm
MIC: 3.5mV}3dB /, 50kohm
Tuner: 140mV}3dB /, 100kohm
AUX: 140mV}3dB /, 100kohm
Tape Mon(Pin): 140mV}3dB /, 100kohm
Tape Recorder(Din): 140mV}3dB /, 100kohm
Sound-recording output Tape Rec(Pin): 150mV}3dB
Tape Recorder(Din): 30mV}3dB
Control Bass: 20Hz}15dB (3dB step)
Midrange: 1,500Hz}5dB (1dB step)
Treble: 20,000Hz}15dB (3dB step)
Loudness (volume 30dB): 50Hz+8dB, 10,000Hz+2.5dB
Switchpoint A high filter: 20,000Hz-18dB (12 dB/oct)
A low filter: 20Hz-26dB (12 dB/oct)
Muting: -20dB
<Synthesis>
Stream composition 31Tr, 5Di
Supply voltage 100V, 50Hz/60Hz
Dimensions Width 435x height 155x depth of 334mm
Weight 12.5kg
Option The wood case made from a walnut (4,150yen)