|245,000yen (July, 1978 release)
The stereo Integrated Amplifier which pursued a good reproduction sound.
Head amplifier is built in so that MC cartridge may connect directly.
Four MOS FET was constituted from a parallel push pull, and 130 W/ch is
All the magnification stages consist of perfect symmetrical
type push pull circuits from the entrance of head amplifier to the final of MOS
although this circuit needs the number of parts close to twice compared
with the ordinary system -- base -- since it excels in the characteristic,
especially a linearity, it has the merit that a low distortion is realizable
by a little NFB.
Thereby, TIM distortion which degrades sound quality has improved sharply.
All the unit amplifier is
considered as direct-current composition.
Moreover, direct-current cut condenser of NF loop which needs large scale
was removed, and coloration is removed.
Newly developed direct-current servo system is adopted, it succeeds
in suppressing direct-current drift, direct-current-ization of the difficult
tone control circuit is realized, and it operates as direct-current amplifier
also in the time of tone control use.
In order to lessen the coloration by a condenser further, the ICL system
which removed the input condenser of each unit amplifier is adopted.
For this reason, the number of the condensers during
the output from AUX and Tuner is one.
The input constituted the
super-low noise transistor from a differential push pull, and has realized the
low input conversion noise level of -150dBV conjointly with low
impedance-ization of NF loop. Moreover, the large dynamic range which does not
generate clipping in any MC cartridges is secured.
Moreover, since it does
not have a condenser, there is no coloring by a condenser.
amplifier can be easily adapted also at the time of 2 arm use -- as -- DISC1 and
2 -- even a switch comes out also to which input, and it changes simply.
Equalizer amplifier enlarges the current of a final transistor, and
makes it Class A operation, an Output load impedance is lowered, and the noise
which also forms NF loop into low impedance and generates it by this in a
difference input circuit is reduced sharply.
The high efficiency and the
low leakage flux type which adopted CI core are adopted as a power transformer.
This CI type of core is the same as the form currently used for the
pillar-shaped transformer of the intense home power source of load fluctuation,
since winding wire is used as 2 division balance type, it is few, and is
efficient and the leakage flux is also excellent also in rate of change.
Expansion of a tone control function is measured and the turnover
changeover switch is carried.
Thereby, as for Bass, 200Hz, 500Hz, and Treble
can choose 2kHz and 7kHz now.
11 contact rotary switch can perform the
variable method, and it can keep change of a step exact.
Moreover, the tone
control ON/OFF switch is also carried.
Hearing impression at the time of
the amount reproduction of low-pitched sound is rectified, and the loudness
Compensation switch which prepares energy balance is carried.
Three kinds of
curves can be chosen according to the characteristic of a regeneration level or
a listening room.
The Subsonic Filter of 17Hz and 12 dB/oct is carried.
The sound quality at the time of ON is thought as important, the input
active device of high-level amplifier is utilized, the active filter is formed
only by the addition of CR, without adding an active device, and sound quality
degradation is suppressed.
The power output meter is carried and the
Direct reading of the output can be carried out with logarithm compression type
An Attenuator switch of -20dB useful when discovering
the start point of a record,When not using a DISC input impedance changeover
switch and a tape recorder, a recording output circuit is cut, and the function
in which the switch which prevents distorted generating, the separate switch
which uses them making a preamplifier and power amplifier become independent,
etc. are useful is carried.
There is an optional wood case.
||Stereo Integrated Amplifier
(at High Level Input, the time of both channel operation)
20Hz - 20kHz, 0.02% or less of a distortion
|4ohm load: 180 W/ch
8ohm load: 130 W/ch
16ohm load: 65 W/ch
|THD (for 20Hz - 20kHz)
||High Level Input->Output: Less than 0.02%
(at the time of an Output power)
High Level Input->Pre Output: Less than
0.005% (at the time of an Output power)
DISC(Head Amp:OFF) ->Tape Rec
Output: 0.005% or less (at the time of 6V output)
->Tape Rec Output: 0.01% or less (at the time of 2V output)
|IM distortion (at the time [ High Level
Input ] of an Output power)
||0.01% or less
||High Level Input: 20Hz-20000Hz+0 -0.2dB
DISC Input: 20Hz-20000Hz+0.2 -0.2dB
||80 (8-ohm load, 40Hz)
|A rated input / input impedance
||DISC1(Head Amp:OFF): 2.5mV/100, 47k and 82k,
1 (Head Amp:ON):0.125mV of DISC(s)/100 ohms
2 (Head Amp:ON):0.125mV of DISC(s)/100 ohms
High Level Input: 160mV/47kohm
Main Input: 1.3V/47kohm
|The DISC maximum input (0.005% of a
||Head Amp OFF:300mVrms
|An Output power/Output load impedance
||Pre Output: 1.3V/200 ohm
Output: 160mV/200 ohms (in the case of DISC)
||Main Input->Output: 27.8dB
Input->Pre Output: 18.4dB
DISC Input(Head Amp:OFF) ->Tape Rec Output:
DISC Input(Head Amp:ON) ->Tape Rec Output: 62dB
|S/N / Input conversion noise
time of input short-circuit, an IHF-A curve, and a rated input)
DISC Input(Head Amp:OFF):86dB/-138dBV
|Volume control linkage error
||Less than 1dB
||500Hz : ±10dB (100Hz)
: ±10dB (50Hz)
||2kHz : ±10dB (10kHz)
COMP of 3:+10dB (50Hz), and +4dB (15kHz)
(with volume control and -30dB)
||17Hz, -12 dB/oct
||Logarithm compression type peak level
dB and the output Direct reading at the time of 8-ohm load
|The semiconductor used
||113Tr, 18FET, 2IC, 39Di
||100V, 117V, 220V, 240V/50Hz, 60Hz
||At the time of no inputting: 100W
time of an 8ohm load Output power: 490W
||the width 445x height 160(piece -- it
includeds) x depth of 370mm
||Wood cabinet A-8 (\15,000)