Audio Database

The

SANSUI AU-70
42,000yen(1964 release)

Description
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The Integrated Amplifier put on the market as the orthodox school of stereo amplifier.

7189 is adopted as an output tube and it is made to operate by AB1P.P. (fixed-bias scheme).
Moreover, a multiplex feedback circuit (the amount of total NF of 26dB) is taken in for the first time in this class in Japan, and the Low-noise-izing covering all the bands is attained.

A noise and distortion are suppressed by using a three-step amplifying circuit for a control amplifier part, and storing all the circuitries in NF loop further.

The transistor circuit index number S= 4, the transistor-noise index number NF = 4 transistor head amplifier original with SANSUI of 2dB is adopted.

The tone control circuit is making treble become independent of a bass for right-and-left each channel of every.
Moreover, the flat property that neither a surge nor a gain fall is is acquired for with a tone defeat (tone circuitry cancellation unit).

The blend circuitry which can control a spread is carried.
Even a stereo can adjust a spread of sound freely from a monophonic recording as the thumb is turned to the right.

The center channel output-terminal is carried and a 3 yuan solid play is possible.

The output level meter which can be switched to three steps, 5W, 10W, and 15W, is carried.


Rating of a mode
Form Tube Integrated Amplifier
<Power amplifier part>
Maximum output 25W-25W
THD (20W) 0.15% or less (1kHz)
0.95% or less (36Hz)
Cross modulation distortion 0.85% or less (15W, 50Hz+5kHz)
Frequency characteristic Less than 10Hz-80kHz}1dB
Output load impedance 8ohm, 16ohm
<Preamplifier part>
Gain (output 20 W:00) Phono(MAG):81dB/1.6mV
Phono(X-TAL):54dB/36mV
Tape:86dB/0.9mV
Mic:86dB/0.9mV
AUX(Tapemon):51dB/50mV
Tuner:51dB/50mV
Tone control CR type
50Hz: +11dB--15dB
10kHz: +12dB--13dB
Equalizer NF type
Tape(BTS)
Phono(RIAA)
<Synthesis>
An attached circuitry Presence control
Turnover : 150Hz
A low filter: 50Hz-12.5dB
A high filter: 10kHz-13.5dB
Loudness control
Tone defeat
Tapes monitor
Headset jack
Tape recorder sound-recording / play connector
The termination for center channel amplifier
Level meter (three-step switching of 5W, 10W, and 25W)
Blend control
The semiconductor used
Thermionic tube (nine pieces) 7189:4 pieces
8:2 6AN
7:3 12AX
Transistor (2SB-381): Four pieces
Germanium diode (OA-81): Two pieces
Silicon diode (subset-dependency-1A): Two pieces
Selenium rectifier (TC.0.2P11/3): One piece
Power source AC100V, 117V and 240V, 50Hz/60Hz
Power consumption 118VA
Dimensions Width 405x height 142x depth of 320mm
Weight 13.7kg