|45,800 yen(around the 1976 time)
The Integrated Amplifier which adopted the sub-
termination structure in order to realize straight circuitry.
termination is directly linked with the printed circuit board, without using a
wire, and an input signal is straight inputted into a circuitry.
the straight transmit is enabled according to a sub- termination layout.
IC stream composition is adopted as an equalizer circuitry. Circuitry
makes the output stage the emitter-follower of the constant current load
intensity by making into the first rank the differential amplification of the
Current-mirror load intensity from which the operating current with very little
noise can be chosen.
Since the large gain of the first rank is taken, the
reduction of a noise level has been realized.
Moreover, in order to acquire
the exact frequency characteristic, the polypropylene capacitor of deflection is
used for an equalizer element }2% with the metal film resistor of deflection
The first rank of a main-amplifier part constitutes the
differential amplifier using the pair transistor of one package, and is operated
by the Current-mirror load intensity. High gain is obtained to a low distortion
by the first rank, and it has become the offensive to which the negative
feedback by NF technology was applied.
For the power transistor, the mass
transistor was used by the complimentary, and a low distortion and low
noise-ization are measured to it.
A protection network-cum-the muting
circuit using a relay is carried, and the noise at the time of power-source
on/off is stopped.
The newly developed high-density volume transformer
that elaborated the technology on the coil and wound the coil around the small
space with high density is adopted as a power-source part. For this reason, a
volume bulk density is large and has obtained the efficient high output.
Moreover, a regulation is also excellent and leakage flux has the special
features, like it is few. A 10,000-micro F electrolytic capacitor is adopted as
The constant-voltage regulated power supply of }2 power source
which used a transistor and zener diode for preamplifier parts is adopted.
Furthermore, the common-emitter power source of the first rank differential
amplifier of a main amplifier is constant-voltage-ized with zener diode, it
supplies, and the stable amplification is enabled.
The Subsonic Filter
using NF loop of the equalizer circuitry is carried.
Since it has the
composition that the selector in sound-recording mode became independent of a
tapes monitor, it is also possible to play other sources during dubbing.
The step type is adopted as a volume 41 point.
the newly developed volume as a tone control -- the middle point of a thumb -- a
circuitry -- signal circuit blank measure. In this location, a signal circuit
serves as only equalizer amplifier and power amplifier, and serves as very
The tone control circuit uses NF circuitry of a main
The high light filter is carried.
A germanium diode
is adopted as a rectification and the output Direct-reading power meter which
raised the linearity at the time of the Koide power is carried.
|The newly developed high-density
volume transformer adopted by SU-7700
|The pair transistor of one package
||Low noise equalizer IC
||Stereo Integrated Amplifier
|<Power amplifier part>
|Effective output (both channel)
|20Hz - 20kHz :
|Output bandwidth (both ch(es), 8ohms)
||8Hz - -55kHz three dB
||Main or Remote: 4ohms - 16ohms
8ohms - 16ohms
||Phono: 2.5mV / 47kohm
Tuner, Aux, Tape1,
2:150mV / 47kohm
|The Phono maximum input (1kHz, RMS)
|SN ratio (IHF-A)
Tuner, Aux: 97dB
||Phono:RIAA standard curve}0.2dB
||Bass: 50Hz, }12dB
Treble: 20kHz, }12dB
||EQ Subsonic: 30Hz-12dB / oct
8kHz-6dB / oct
||Width 410x height 140x depth of 315mm