|430,000yen(around the 1981 time)
The stereo preamplifier which pursued a beautiful
sound and was completed with an advanced technology and the component partses
The equalizer circuitry has secured the high
allowable input by the high-voltage design of 140V.
The attenuator type
4-unit volume of 22 contacts is adopted as a volume.
It has controlled with
the top of flat amplifier at two places of the last stage of amplifier, and the
remains noise is reduced.
The thing of special edition is altogether adopted as a part or product-line material, and contest a Mylar, the polystyrene capacitor, contest electrolysis, and contest VII are adopted as a capacitor.
In order to suppress a distorted occurrence as much as
possible, the oxygen-free-high-conductivity-copper line is adopted as
The 140micro thickness Copper-foil glass epoxy
group board is adopted as a substrate.
Although the conventional glass epoxy group board was sticking and using
a 35micro Copper foil, in order to aim at DCR (direct current resistance)
in a substrate, and a falloff of an inductance, the 140micro Copper foil
which increases 4 times over the past is adopted.
order to secure the stable performance and robustness, all of an input/output
terminal and the termination of each assembly are raising the conduction
characteristic sharply, such as using gilding.
In order to stabilize a plating and to stick conventionally, nickel plating
had been performed to the ground. However, since ferromagnetic material,
nickel had the distorted occurrence resulting from a hysteresis.
It plated with the newly developed pin jack adopted as C3a on the ground
of non-magnetic material which shows nickel, equivalent, or the stability
beyond it, and the distorted occurrence was prevented and the stable contact
performance has been obtained.
The hi-reliability and the mass (15A) power cord which performed the
double insulation are adopted as a power cord.
Furthermore, the polar unification is aimed at by classifying the cable
of a power cord by color by white and black, and managing the interconnection
with AC plug.
A connecting cord is suppressing the distorted occurrence in a connecting
cord, such as using for a pin plug the gilding plug which consists of a
non-magnetic-material ground, as much as possible while using an oxygen-free-high-conductivity-copper
line for a material. Moreover, the structure of the connecting cord is
aiming at the reduction of the inductance by adopting a different star-quad
scheme from the conventional coaxial structure which made the cable with
which a signal line counters mutually gather. Furthermore, the perfect
shielding according a signal line to an electrically conducting polymer
material and a braid is performed.
is little distorted occurrence by these and quality signal transmission is
possible at a low loss.
||Equalizer amplifier: Differential three-step
hardwired-connection Class-A SEPP circuit per step
Differential three-step hardwired-connection circuitry per step
2:2.5 mV - 10mV of Phono / 25kohm, 50kohm, 100kohm
Tuner, Aux1, 2,
Tape PB1, 2 or 3:150mV / 100kohm
Aux3:150mV - infinity/100kohm
|Phono maximum permissible input
of a THD, 1kHz)
|An Output voltage/impedance
||Tape rec1, 2 or 3:150mV / 2.5kohm
|OutputA, B (RL:50kohm) :
||2V/600 ohm (rate)
15V/600 ohm (maxima)
|Headphones (RL: 8ohms) :
||170mV/40 ohm (Output 100mV o'clock)
500mV/40 ohm (maxima)
|THD (20Hz - 20kHz)
||0.01% or less (at the time of 2V output)
0.01% or less (at the time of 15V output)
Tuner, Aux, and
Tape PB:20Hz-20kHz+0 -0.5 dB
10Hz-90kHz+0 -1 dB
||Bass main: }7.5dB (100Hz), a 1.5dB step
Factice: }6dB (50Hz), a 1.5dB step
Treble main: }7.5dB (10kHz), a 1.5dB
Factice: }6dB (20kHz), a 1.5dB step
||Low cut: 15Hz (12 dB/oct), 30Hz (18 dB/oct)
High cut: 12kHz (12 dB/oct), 8kHz (18 dB/oct)
|S/N (IHF, A network)
Tuner, Aux, Tape PB: 90dB or
|The semiconductor used
||Transistor: 65 pieces
Diode: 48 pieces
(maximum electric power consumption)
|25W (Electrical Appliance and Material
||Power-switch interlock: Three lines
Power-switch un-interlocking.: Three lines
||Width 468x height 206x depth of 342mm
||A relay code with a pin plug