|99,800yen(around the 1975 time)
The Integrated Amplifier which made full use of the
experience and the technology in a high-class component, and was completed.
Including a Phono circuitry, the structure of the panel on the back
attached input terminals upward, and has linked it directly by the substrate and
the shortest distance of an equalizer amplifier.
The necessity that this uses the shielding wire constituting the cause
of a failure of a high region property was lost, an SN ratio is high and
the high region property has realized the good tone quality.
It has the printed circuit board of control amplifier, and rotary switches,
lever switches and the unification structure where various volumes were attached
directly as for picking.
This prevents a malfunction of a faulty connection
etc. and the robustness is improved.
In connection with the chassis less
structure, the Tip-of-the-Day grounding is carried out and the electric-current
cross interferencee is suppressed.
Power amplifier consists of a
three-step drive stage of a Darlington connection which had a
differential-amplification circuitry in the first rank, and a power stage by a
parallel push pull scheme.
A parallel push pull scheme is the power
transistor to which the property was equal per channel,Combining four pieces,
the linearity of a current characteristic is good, and the phase response was
excellent, big negative feedback was applied over the wide band, and the whole
page hardwired-connection pure complementary circuit has acquired the flat
The equalizer circuitry has adopted the
equalizer circuitry of 4 stone stream compositions which have a
differential-amplification circuitry in a first rank input.
range excellent in selecting carefully and using an element is realized.
In addition to Bass and Treble, the triple tone control which can also
adjust Midrange is carried.
The stream composition of tone amplifier is
considered as 6 stone stream compositions which have a
differential-amplification circuitry in the first rank, is selecting carefully
and using the low-noise type transistor and highly precise CR element, and also
has adopted the detent type volume with little error.
The tone multiple
contact switch which Bass of a tone control, descent of Treble, and an elevation
frequency can choose as three points is carried.
The high filter which
adopted the active filter only for NF type with a sufficient property is
A damping characteristics can be chosen from two kinds, and by a
defeet position, it becomes unrelated to a filter circuit and becomes a flat
Moreover, the low filter of two-step switching is also carried.
Since the potential of the input/output circuitry of the stage of each
block is about 0v potential, it has prevented the it1 noise generated at
the time of a multiple-contact-switch switchover.
At the time of a
defeet, the perfect defeet scheme which bypasses a tone circuitry and a filter
circuit is adopted.
At the time of this defeet, it becomes a whole page}2
The heavy weight class power transformer and the
large capacity power supply capacitor of 10,000 micro Fx2 are adopted as a
power-source part, and }2 power source with a regulation strong to the load
variations at the time of the Dainyuu power etc. and sufficient is supplied.
Moreover, the power stage and }2 power supply stabilizing circuit by the
coil of another system perform a powering in an equalizer circuitry and a tone
circuitry, and the influence of the power stage is suppressed.
The high-sensitivity relay was combined with the electronic circuitry, and also the protection network which uses an immediate judgment fuse is adopted.
This detection circuitry that operates a circuitry mostly is
the temperature perception circuitry of a power transistor, a transistor safety
area detection (ASO) circuitry, an overcurrent detection circuitry, an
abnormal-voltage detection circuitry of a speaker protection, and a
The loudness switchpoint of two-step switching is
carried. The usual low high region boost and two-step switching of only a
low-pass Booth are possible.
- A fine tune of music level is also
possible at a damping of 15dB and -30dB.
Stereo Normal / reverse /
monophonic mode changeover switch is carried.
Two tapes monitor
circuitries are carried and the sound recording of the special-NetWare-program
source and the monitor under sound recording can also be performed.
Moreover, a tape copy is also possible.
The pre-main isolation
switchpoint is carried, a preamplifier part and a main-amplifier part are
separated, and it can be used independently.
According to a cartridge, a
load impedance is changed to the inside of a Phono input circuit by three steps,
30kohms, 50kohm, and 100kohm, Phono1.
2 sets of speaker systems, A and
B, can be sounded with a switching of a switchpoint independently and
The large-sized grounding terminal and the standby AC plug
socket are carried.
The side panel made from die casting is adopted.
the good aluminum of a feel -- the pure thing metal thumb is adopted.
|Both channel operation
1kHz: 55W+55W (8ohm)
||250W (4 ohms, 1kHz)
||Pre Amp: 0.1% or less
Main Amp: 0.1% or
Over All: 0.1% or less
|Cross modulation distortion
|Pre Amp: 0.1% or less
Main Amp: 0.1% or
Over All: 0.15% or less
|Power Band Width (IHF)
||5Hz - 40kHz
|Frequency characteristic (at the time of 1W
||10Hz-50kHz+0.5 -1 dB
|RIAA deflection (30Hz - 15kHz)
||Phono1:2.5mV/30kohm, 50kohm, 100kohm
Tuner, AUX, Tape Monitor(Pin/Din):100mV /, 50kohm
Main Amp: 800mV / 50kohm
|Phono maximum permissible input (less than
|Output voltage (1kHz)
|channel separation (1kHz)
||Phono: 50dB or more
Monitor: 55dB or more
Main Amp: 60dB or more
|A hum and a noise (IHF)
||Phono: 75dB or more
Tuner, AUX: 85dB or
Main Amp: 100dB or more
||Bass: }13dB (50Hz)
Midrange: }5dB (1kHz)
Treble: }13dB (15kHz)
|loudness (Volume-30dB o'clock)
||High & Low: +10dB (50Hz), +8dB (10kHz)
|A low filter
|A high filter
||Width 434x height 130x depth of 315mm