||64,800yen(around the 1986 time)
The Integrated Amplifier which carries the classAA
technology of SE-A100/SU-A200.
In classAA, it has VC-4 amplifier
composition which arranged two kinds of amplifier, the voltage control amplifier
of the pure Class-A operation without the influence of switching distortion and
crossover distortion, and the electric-current drive amplifier for driving a
speaker dynamically, on L/R of each.
Thereby, voltage control amplifier was
released from a heavy burden called a current supply source, and could control
the voltage to an input signal faithfully, and electric-current drive amplifier
supplied the electric current required for a speaker drive, and has eliminated
it from ill effects, such as an impedance variation of a speaker.
A large-sized transformer and a mass capacitor equipped with 300A thing
instantaneous current supply capacity and the outstanding linearity are
adopted as a power-source fraction. Moreover, the distortion of a high
region by electromagnetic radiation is canceled by the original concentrated
power block by unifying an output stage and a power-source part with a
skillful stream composition.
The Lec mode
selector which can choose the sound-recording source independently is carried.
It is possible to carry compact-disk direct functionality and to connect
with a volume direct without an input selector.
The phone equalizer part
serves as a high gain type of MC basic design, and has first rank amplifier of
super-low-noise FET adoption, and interrupt-control-logic composition which
combined high resisting pressure and quantity slew-rate operational amplifier.
The large-sized metals foot is adopted and the ill effect by an
extraneous vibration is stopped.
|classAA conceptual diagram
|Effective output (20Hz - 20kHz)
||100W+100W (6 ohms, 0.004%)
||0.002% (Output-power-3dB, 20Hz - 20kHz)
||20Hz-20kHz+0 -0.2 dB
5Hz-120kHz+0 -3 dB
||main or remote: 6ohms - 16ohms
remote: 12ohms - 16ohms
||Phono man month: 2.5mV / 47kohm
MC: 170 microvolts/220 ohms
Tuner, Aux, Tape:150mV /, 22kohm
|Phono SN ratio
||man month: 86dB (2.5mV input)
|Phono frequency characteristic
||30Hz - 15kHz, RIAA}0.8dB
||Bass: }10dB (50Hz)
Treble: }10dB (20kHz)
|Loudness control (VR-30dB)
||Width 430x height 116x depth of 340mm