|150,000yen(around the 1975 time)
It is the high-class Integrated Amplifier which adopted the whole page
direct connection circuit.
The whole page direct
connection pure contest OCL system has realized high power.
the temperature drift of output end direct-current voltage, the new
magnification circuit which shows very few drifts in the large temperature range
is adopted. Highly efficient-ization is measured using the part with large
The super-low noise transistor developed with the low
concentration diffusion technology of the Diatone is adopted as first rank
Compared with the conventional low noise
transistor, a 1/f noise of about 2dB is improved, and the dynamic range is also
The pair transistor to which the nakedness characteristic was
equal is adopted as a power stage and a driver stage, and distortion at the time
of an open-loop is lessened.
The distortion at the time of the Koide power
decreased by this, and it has contributed to expansion of a dynamic range.
In order to intercept from a high fever and magnetism which are
generated from a power block, it separates clearly and a pre-block is arranged
in a front part. Furthermore, it is shielding.
It could maintain at a
temperature lower 10 degrees C or more than a power block in the state of
anticipated use by this, and the stability of a transistor with a high
temperature dependence and the reliability of each part are raised.
power part and the Puri part are connected with the bottom of both blocks, and
have become little design of a secular change etc.
The presence control
which can amplify inside compass in broadcloth at a 1dB step is carried.
change (800Hz and 2000Hz) is possible for center frequency.
control circuit separates a damping time constant circuit, and is considering it
as the circuit composition from which a flat frequency response is acquired in
the flat position.
The working range where a transistor is linear is
wide, and, moreover, tone control amplifier and presence control have adopted
amplifier with high stability independently, respectively.
22 contact Attenuator is adopted.
The characteristic of attenuation degree deflection and a gang error is less than 1.5dB to the degree of attenuation of 28dB with less than 1dB and the degree of attenuation of 30dB or more.
Power ratio 2.9.
|<Power amplifier part>
|Output (both ch operation)
|20Hz - 20kHz :
||0.1% (at the time of rating)
|Cross modulation distortion
||0.05% (1 W:00)
||10Hz - 30kHz
||2.5mV/30, 50, 75kohm
|High Level Input:
|An Output voltage/impedance
|Rec1, 2 :
|High Level Input:
||20Hz-20kHz+0 -0.5 dB
||}3dB (800 or 2kHz)
||Bass: }10dB (100 or 50Hz) (Turnover 500,
Treble: }10dB (10 or 20kHz) (Turnover 2.5, 5kHz)
||Low: 15 or 40Hz (12 dB/oct)
High: 9 or
15kHz (12 dB/oct)
|Phono allowable input
||320mV (distorted [ 0.1% ] 1kHz)
|Input conversion noise
||Width 425x height 148x depth of 387mm