|73,000yen(around the 1978 time)
The Integrated Amplifier which aimed at the
characteristic improvement by direct-current-izing high level input or
In order to improve a low-pass phase distortion and transient distortion,
dual FET which the Diatone developed is adopted and direct-current-ized
to the power block. Moreover, as ICL-OCL composition, the pre-block excluded
the condenser from the signal course after high level input, and has improved
the standup and transient of sound.
in S/N is aimed at by improving how to use a first rank transistor.
head amplifier part is using the transistor different from former based on the
idea of regazing at the transistor itself. Furthermore, the circuit composition
which decreases a noise also about a circuit is adopted. The characteristic is
improved compared with the case where this uses a pressure-up transformer.
Moreover, a MM/MC car type cartridge can connect Phono2 only for MM
The power level indicator by 15 LED located in a line
with V character type is carried. Moreover, the power level indicator ON/OFF
switch is carried in DA-U 680S.
It has been independent about the power source of a pre-block and a power
block, and a high fever and the magnetic influence which are generated
from a power block become difficult to attain to a pre-block, and are raising
the stability of an element and a circuit.
tape deck is connectable two lines. Moreover, a tape duplicate mechanism can
perform easily the copy to the tape 1 -> tape 2/the tape 2 -> tape 1.
Bass/Treble can switch two steps of turnover frequency of tone control.
Moreover, the tone-defeat switch is carried.
- Carry a muting switch
of 20dB, and the Subsonic Filter.
There were two kinds, DA-U680 to which
equipped the carrying handle for rack-mounted one and the ON/OFF switch of the
power level indicator was abbreviated, and DA-U 680S which carries an indicator
|<Power amplifier part>
||80W+80W (8 ohms, 20Hz - 20kHz)
(8 ohms, 1kHz)
||0.01% (at the time of 8 ohms and an Output
0.005% (at 8 ohms, the time of 1W output 20Hz - 20kHz)
|Output bandwidth (IHF 0.1% distortion,
||10Hz - 70kHz
|S/N (A network, input end short-circuit)
||60 (8 ohms, 20Hz - 20kHz)
||Phono1, 2 MM:2.3mV /, and 50kohm, 100pF
Phono2 MC: 0.1mV/ten ohms
Tuner, Aux, Tape1, 2:150mV/50kohm
|An Output voltage/impedance
||Pre out: 1V/600 ohm
|THD (Pre out, 1V)
VR -20 dB, 20Hz -
|Phono1, 2 MM: 0.005%
Tuner, Aux, Tape1, 2:0.004%
|S/N (A network)
||Phono1 MM: 84dB (input end short-circuit)
Phono2 MC: 77dB (47ohms of input end termination)
Tuner, Aux, Tape1,
2:108dB (input end short-circuit)
||Bass: ±10dB (100Hz, 50Hz)
||18Hz, 6 dB/oct
||DA-U680: Width 480x height 154x depth of
DA-U 680S: Width 424x height 154x depth of 374mm