|220,000 yen(March, 1983 release)
Control amplifier which aimed at the input terminal and the substantial function
as an inheritor of C-220 which the acquisition of main elements of became
impossible and carried out the end of production in 1980 though the chief aim
was put on disc playback.
The circuit composition of equalizer amplifier
and high-level amplifier is a predrive in the difference input and dregs cord
through an FET buffer, and a final by Darlington, and the whole of each stage
consists of push pulls.
the base before this gives NFB -- the characteristic
has been improved and high quality is realized.
The composition which
inserts exclusive flat amplifier in front of equalizer amplifier is adopted as
the head amplifier for MC cartridges. Direct input of the circuit composition is
carried out without the FET buffer, it selected the low noise element carefully,
measured low impedance-ization of the NFB loop simultaneously, and has prevented
generating of noise.
In MC head amplifier part, since the noise of the
constant voltage circuit of a power source has big influence on S/N of a signal
system, the low noise design which selected the element of the constant-voltage
power-source part carefully, and was put into practice is performed.
Moreover, the maximum inlet pressure is 150mV so that it may not be
saturated, also when mighty MC input passes.
circuit by IC was adopted as each of equalizer amplifier, high-level amplifier, and head amplifier, and a direct current generated in the output was detected,
it returned to the input, and generating of direct-current drift is prevented.
Thereby, generating of direct-current drift becomes that there is almost
nothing, and is making all the signal systems of the output direct connection
from MC input.
Each unit amplifier is driven by the independent winding
wire independent rectifier circuit, and the multiple power supply system which
installs a constant-voltage power supply circuit in the near position of each
unit amplifier further constitutes the perfect independent power source
The signal from an input terminal was directly linked
with the printed circuit board, the relay was entered and carried out to the
near position, and the logic relay control which controls a relay by a logic
circuit is adopted. This shortest-ized the signal course and degradation of the
signal by leading about of excessive wiring is prevented.
In this case, the
high reliability relay of the crossbar twin system developed as an object for
audios is adopted especially as the relay used. A contact makes a golden thin
film form on a silver palladium alloy, by using an encapsulated type, is
intercepted from the open air and is raising durability.
In order to
correspond to various MC cartridges and to be able to control sound quality
minutely, MC input impedance is changed to a three-stage.
Moreover, the gain
changeover switch is provided so that high gain of 32dB can be obtained to
everything but a usual head amplifier profit of 26dB for a low output MC
It is possible to carry MM load capacitance change function which tunes the high region characteristic of MM cartridge finely, and to add three kinds of capacity.
Two sets of tape contact buttons are carried, and
recording, playback, and a monitor are possible.
It is possible to carry
the Attenuator which can leave volume control as it is and can lower a level, and to lower a level to -20dB.
The Subsonic Filter of -12 dB/oct which cuts only a subsonic noise without
affecting an audio frequency band is carried.
Instead of tone control, the Compensation which rectifies a frequency
response automatically with the position of volume is carried. This function can
choose two kinds of characteristics with a switch.
The headphone jack is
There were C-222A to which the gold tone as a front panel main
part in which those with two kind and a sub panel have the same design of the
front panel was made, and C-222B made only to the sub panel with black.
Moreover, there was a cabinet of natural rosewood finishing as an option.
|Tuner, Line, Tape play :
||1.0Hz-500kHz+0 -3.0 dB
|THD (IHF, 20Hz - 20kHz)
||0.005% (with all the input terminals)
power / IHF output 0.5V)
|Disc(Head amp off) MM: 2.0mV/0.5mV/47kohm
Disc (Head amp+26dB): 0.1mV/0.025 mV/10ohm, 30ohm, 100ohm
amp+32dB): 0.05mV/0.0125 mV/10ohm, 30ohm, 100ohm
Tuner, Line, and Tape
|An Output power/impedance
||Outputs: 2.0V/1.0 ohm
126mV/200 ohms (at the time of Disc)
|S/N and input conversion noise
short-circuit IHF-A compensation
|Rated input S/N
||Input conversion noise
|Disc(Head amp off)MM:
|Disc(Head amp +26dB):
|Disc(Head amp +32dB):
|Tuner, Line, Tape play :
|Maximum-except-take-off level (0.005% of a
distortion, 20Hz - 20kHz)
Tape rec: 19.0V (at the
time of Disc)
||Conformity impedance: 4ohms - 100ohms
|The Disc maximum inlet pressure (1kHz,
0.005% of distortion)
||Head amp off:300mV
Head amp +26dB:15mV
Head amp +32dB:7.5mV
|Minimum load impedance
Tape rec: 10kohm
||Tuner, Line, Tape play->Outputs:24dB
Tuner, Line, Tape play->Tape rec:0dB
Disc(Head amp off, MM)
Disc(Head amp off, MM) ->Tape rec: 36dB
is +26dB and +32dB change type.
|Loudness Compensation (Volume-30dB)
2: +8dB (100Hz), +6dB
||17Hz, -12 dB/oct
|The semiconductor used
||Transistor: 109 pieces
FET: Nine pieces
IC: 13 pieces
Diode: 94 pieces
|Power supply voltage
||the width 445x height 128(piece -- it
includeds) x depth of 373mm
Width 466x height 153x depth of 385mm (at the
time of wood cabinet wearing)
||Wood cabinet A-9 (16,000yen)