|79,000yen(October, 1982 release)
The Integrated Amplifier of the REVOLVER series
which supplied the Duo beta technology.
The Duo beta circuit / S of
one-step amplification amplifier are carried in the power amplifier part.
A Duo beta circuit / S is with the "one-step amplification amplifier"
which makes the amplification stage of an amplifier circuitry only one
step, and realizes a low distortion with an open loop,The "Duo beta
circuit" which combined DC servo tightened to an amplifier circuitry
from the super-low-pass one besides proper-quantity NFB covering all the
bands, and an audio frequency band,It is the generic name which summarized
three of power circuits "plusX" which gives generous stabilization
damping force to a power source,By this, since there is little high region
stagger, a stability to the extent that the high region correction by phase
gap is not needed is acquired, and also the factor in which a slew rate
gets worse in addition to the threshold of an element is lost out of the
circuitry inside amplifier, and it is wide opened from the ill effect of
Izu of a power source.
The Duo beta circuit is carried in the equalizer
Moreover, the original phone straight functionality is carried, and
contact leading about, such as not a mere it1 but light filters, a balance
control, and selectors, is put into practice and separated about the disk reflex
The frequency-shifts type is adopted as a tone control.
Since a variation and the frequency which begins to change interlock and it
operates, effective tone control is possible.
||75W+75W (8 ohms, 1kHz, both ch(es))
||0.009% or less (8 ohms-3dB, 20Hz - 20kHz)
|Cross modulation distortion
||0.009% or less (8 ohms, 60Hz:7kHz=4:1)
||Phono man month: 2.5mV/50kohm
MC: 100 microvolt/High-Low switching
Tuner, AUX/DAD, Monitor:200mV/40kohm
Main In: 200mV/50kohm
|SN ratio (IHF-A)
||Phono man month: 90dB (input short-circuit,
Phono MC: 67dB (input short-circuit, 250-microvolt
Tuner, AUX/DAD, Monitor, Main In: 110dB
AUX/DAD, Monitor, Main In: 10Hz - -100kHz one dB
||}8dB, a turnover shift type
|Puri part output
||Subsonic Filter: 30Hz
A high cut-off
|A low boost
||+ 8dB, 70Hz
||Two lines (Tape-1, Tape-2)
||Width 453x height 135x depth of 425mm