|195,000 yen(September, 1984 release)
MC head amplifier developed aiming at transmitting the individuality of a
C-17 constitutes all the magnification stages from a
cascode push-pull amplification circuit, and is.
connected two elements, was operated just like one element, does not almost have
the feedback in the core of an element, and there is little generating of noise and it has the feature that linearity is good, covering high frequency from low
By constituting this in a push pull, it is the amplifier
excellent in distortion, noise, and a frequency response.
circuits were stored in aluminum housing of right-and-left independence, and
resonance by a guidance noise and vibration is prevented.
noise-ization is performed and low impedance-ization of the NFB loop is attained
to adoption of a low noise element, and the noise generated in a difference
Moreover, in order to avoid the influence of the noise
generated from direct-current servo circuit, S/N of theoretical full limits is
realized by returning to the base of a current generator instead of the system
which returns to the minus side of differential amplification directly.
The power-source part is using the power transformer for exclusive use
for a right-and-left channel, and serves as a mono-construction.
Furthermore, in order to carry the constant-voltage power source only for a
right-and-left channel in order to attain low impedance-ization over a
broadband, and to make the wiring course of this constant-voltage power supply
circuit into the shortest, it has stored in the same aluminum housing as a
In order to correspond to various MC cartridges
and to be able to control sound quality minutely, MC input impedance is
considered so that it may change to a three-stage (10ohm, 30ohm, and 100ohm).
When the impedance of a cartridge is around 3ohms, 10ohm or 30ohm is suitable
for load. And in more than a 10-ohm class, 30ohm or 100ohm is suitable
Moreover, for the low output MC cartridge, the gain changeover
switch is provided in everything but the usual profit of 26dB so that high gain
of 32dB can be obtained.
||MC head amplifier
||0dB (MM), +26dB, +32dB
||20Hz-20kHz+0 -0.2 dB
|The maximum inlet pressure
(1kHz, 0.005% of distortion)
|+ 26dB position : 150mV
+ 32dB position
|Rated inlet pressure
||+ 26dB position : 0.1mV
+ 32dB position
||0.005% (at the time of 20Hz - 20kHz, and the
|S/N and input conversion noise
short-circuit and A compensation
|It is S/N at the time of a
||Input conversion noise
|+ 26dB position :
|+ 32dB position :
||10ohm, 30ohm, 100ohm, a change type
|Output load impedance
|Minimum load impedance
|The semiconductor used
||Transistor: 71 pieces
FET: Four pieces
IC: Eight pieces
Diode: 64 pieces
|Power supply voltage
||Width 194x height 142x depth of 371mm