|98,000yen(September, 1973 release)
The Integrated Amplifier announced as a high end
representing a Lux of 500 serieses.
The whole page hardwired-connection
pure complimentary scheme is adopted as a main-amplifier part.
Darlington connection of the power transistor of a NPN type and a PNP type is
carried out respectively, and in order to make completely symmetrical the
switching characteristic of the upper half cycle and a lower half cycle, the
power transistor of a pair to which the current amplification factor (hfe) was
equal is adopted as the Class B operation fraction of the power stage. The
reliability at the time of an outgoing-end short-circuit is raised to both an
output stage and the Class B driver stage by adopting the transistor excellent
in the high region property and the destructive-proof property.
cut-off frequency is high in the pre-driver stage, especially few transistors of
a collector output capacitance are adopted as it, and the two-step
differential-amplification circuitry by low electric-current drive is
constituted. From the time of a non-signal, the Class B operation stage is
maintained at the status that it was stabilized, by driving with the electric
current fixed till the maximum output, and notching distortion is suppressed.
While adopting the three-step hardwired-connection circuitry constituted
from a NPN type-PNP type-NPN type transistor with an advantageous voltage
utilization factor and obtaining the outstanding linearity, direct-current
stability is raised to it, fully applying a direct-current feedback to the
equalizer stage of a preamplifier part.
Moreover, the deflection with a
standard RIAA curve made the allowable error of the using part small, and it has
dedicated to less than ±0.5dB by suppressing variation.
The gentle Lux
scheme NF type of a transition property is used for a tone control circuit. He
can be trying for low-pass and a high region to switch the curving point
frequency which begins to change three point respectively, and a coordination of
a finer tone quality is possible.
Moreover, a tone defeat is also possible.
In the filter circuit, a low cut serves as CR form and the high cut
serves as NF type.
Moreover, the low boost circuitry serves as NF form.
The Puri part whole page was covered and the SN ratio is improved by
adopting a super-low-noise transistor.
Moreover, to the capacitor of the
input and the output circuit, the leakage current is holding down the shocking
noise at the time of a switchpoint switching by adopting what was further
selected carefully from the inside of few Mylar capacitors and a tantalum
Two 10,000-micro F electrolytic capacitors are used for the
filter circuit of a power-source part.
Moreover, the muting circuit is carried in order to stop the shocking noise
at the time of power activation and a shutdown.
||Stereo integrated amplifier
|Succession effective output
||50W+50W (8 ohms, both channel simultaneous operation)
60W/60W (ohms [ 8 ], one-side-channel operation)
||0.03% or less (8ohm, 50W)
|Cross modulation distortion
||0.04% or less (8ohm, 50W, 70Hz:7kHz=4:1)
||5Hz - -50kHz three dB (0.1%)
||0.5mV or less
||40 (8 ohms, 20Hz - 20kHz)
Remote speaker switchpoint
|Standard output voltage
|Maximum output voltage
|Output load impedance
||Pre out: About 100ohms
Rec out: About
||10Hz - -50kHz one dB (Aux1)
||0.04% or less (Aux1, 1kHz, 1V)
||Phono1, 2:2.4 mV
Tuner: 100mV (with an
input level set)
||Phono1:50kohm, 65kohm, 90kohm, a
||Phono1, 2:65dB or more
Mic: 60dB or more
Tuner, Aux1, 2:80dB or more
|Maximum permissible input
||Phono: 300mV (1kHz, R-M-S)
||With a curving [ LUX scheme NF type ] point
The point curving [ low-pass ]: 150Hz, 300Hz, 600Hz
curving [ high region ]: 1.5kHz, 3kHz, 6kHz
||A low cut: 30Hz, 6dB / oct
A high cut:
8kHz, 6dB / oct
|A low boost
||Tapes monitor switchpoint (two lines)
Input level set
|The semiconductor used
||2SC1345 (12 pieces)
2SA640 (four pieces)
2SA606 (two pieces)
2SA620K (four pieces)
2SC1103A (four pieces)
2SC1431 (two pieces)
2SA762 (two pieces)
2SB541A (two pieces)
2SC853 (one piece)
2SA562 (one piece)
2SC496 (one piece)
||1S1555V (two pieces)
1S188 (four pieces)
|Zener diode :
||WZ120 (two pieces)
||SV-03 (two pieces)
SV-02 (two pieces)
||200W (at the time of an 8-ohm simultaneous
load intensity and the maximum output)
||Width 450x height 160x depth of 268mm