||270,000 yen(June, 1980 release)
280,000 yen(January, 1983 amendment)
Stereo control amplifier which introduced the newest technology and gave the
extensive improvement based on C-200 and C-200S.
Based on all the
magnification stage push pull systems, the dregs cord bootstrap push pull
difference input system is adopted. By dregs cord bootstrap, while obtaining a
big gain, the high region characteristic is improved, and aggravation of the
distortion by the rise of input impedance is also improved simultaneously with
This circuit is used for equalizer amplifier and high level tone control
direct-current servo system is adopted as equalizer amplifier
and high-level tone control amplifier, and it is considered as direct connection
perfect from MM disc input to an output.
IC is used for direct-current servo
amplifier, and the output of IC has adopted the method of not controlling the
signal system of difference input amplifier directly, but controlling the base
current of a current generator.
In this servo circuit, it can suppress to
the minimum that the noise of a servo system influences a signal system, and
excels in direct-current drift control capability. For this reason, the effect
which was excellent even if it used it for the high equalizer amplifier of a
low-pass profit can be acquired.
The head amplifier part consists of an
input of a differential push pull, and an output circuit of RET pure
complimentary. Moreover, the input unit which affects sound quality is taken as
the direct connection system which does not use a capacitor.
multiple power supply system which arranges the independent constant-voltage
power source by RET and IC is adopted as a total of each six right and left of
head amplifier, equalizer amplifier, and high-level amplifier.
These are arranged at the near place of the circuit, respectively, and since they hold low
impedance over a still larger zone, they are suppressing interference between
The amplifier only for direct-current AClass composition pure complimentary
direct connection is used for a headphone amplifier part.
Between unit amplifier and the power-source part, and the mother board
system performed to combination of a function in part in a print circuit are adopted.
The socket which carries out plug-in of each unit amplifier, a
power transformer and a commutator, the filter capacitor, and the push switch of
the front panel are mounted by the mother board of glass epoxy.
is connected with the conductor route formed into the print circuit, it is lost
with the rose of the characteristic by the unevenness of leading about which
tends to take place with wire wiring, and the uniform engine performance is
The 2dB step system by a right-and-left independent type 11 contact rotary
switch adopted since C-200 is adopted as a tone control part.
The turnover changeover switch is also prepared and the ON-OFF switch of
which tone control is canceled is also carried.
Hearing impression at
the time of the amount reproduction of low-pitched sound is rectified, and the
loudness Compensation which prepares energy balance is carried.
possible to choose two kinds of curves according to the characteristic of a
regeneration level or a listening room.
The Subsonic Filter and the high
filter are carried.
- Carry the function of an Attenuator switch of
20dB, the mode switch by 5 contact rotary switch, a disc input impedance
changeover switch, an output ON-OFF switch, etc., etc.
There was a wood
case as an option.
||Stereo control center
|Frequency response (new IHF)
||highlevel: 20Hz-20kHz+0 -0.2dB
|THD (new IHF)
||0.005% or less (20Hz - 20kHz)
power / new IHF0.5V output)
|disc1, discFront MM:2.0mV/0.5mV/100, 47k and
82k, 150kohm (head amp off)
disc2 MM: 2.0mV/0.5mV/47kohm (head amp off)
disc MC: 0.1mV/0.025 mV/100 ohms (head amp on)
tuner, aux, and tape
|An Output power/Output load impedance
||output: 2.0V/2 ohm
tape rec: 126mV/200
ohms (at the time of a disc input)
||Output load impedance: 0.3ohm
0.25W (8 ohms, 1kHz, 0.01% of distortion)
|disc(head amp off):
||85dB (a rated input, input short-circuit, A
82dB (new IHF)
|disc(head amp on):
||72dB (a rated input, input short-circuit, A
74dB (new IHF)
|tuner, aux, tape play :
||110dB (a rated input, input short-circuit, A
88dB (new IHF)
|Input conversion noise
||disc(head amp off):-139dBV
tuner, aux, tape play:-128dBV
||10V (0.005% or less of a distortion, 20Hz -
|The disc maximum input
(1kHz, 0.005% or
less of distortion)
|head amp off:400mVrms
|Minimum load impedance
tape rec: 10kohm
|tuner, aux, tape play->
|disc(head amp off) ->
output: 60dB (at the time
of head amp on: +26dB)
||The step type by 11 contact rotary switch
||Low-pitched sound: 200Hz, 500Hz
sound: 2kHz, 7kHz
||500Hz : }10dB (100Hz), a 2dB step
: }10dB (35Hz), a 2dB step
||2kHz : }10dB (10kHz), a 2dB step
}10dB (35kHz), a 2dB step
comp of 2:+10dB
(100Hz), +5dB (20kHz)
||Subsonic Filter: 17Hz, -12 dB/oct
filter: 8kHz-12 dB/oct
|The semiconductor used
||Transistor: 102 pieces
FET: 29 pieces
IC: 11 pieces
Diode: 50 pieces
|a Dimensions (a piece -- it includeds)
||At usually, the time: Width 445x height 160x
depth of 373mm
At the time of wood case wearing: Width 466x height 190x
depth of 385mm
||Wood case A-8 (16,000yen)