|60,000yen(around the 1980 time)
The preamplifier of a
simple stream composition of having been devoted to the single functionality, in
order to pursue a tone quality on the contrary at the origin of a preamplifier
and to realize a tone quality with a high purity.
Two steps of
differentials and current mirror circuitry Class-A SEPP are used for the circuit
system of an equalizer amplifier.
Many properties are improved by this
circuitry that made importance the improvement in a distorted reduction and an
Furthermore, }0.5% of a resistance-value error and the precision small
metals skin membrane resistance of }100 ppm/degree C of temperature characteristics
are used for an equalizer element. Moreover, elements selected carefully,
such as a polypropylene capacitor of }1% of a capacity error, are used.
high voltage of }37V was impressed to this circuitry, and the generous dynamic
margin of 300mV of maximum permissible inputs is secured in it to the
sensitivity of 2.5mV.
Since the performance of various cartridges is
demonstrated, it can be independent respectively, six sorts of load resistance and six sorts of load capacity can be chosen, and a total of 36 sorts of
cartridge loadings can be set up.
Moreover, the position of 100 ohms of load
resistance is suitable for connecting MC cartridge with a large Output voltage
The flat amplifier part as well as an equalizer part has adopted
the 2 steps of differentials amplification.
The using and interval of an
element which had adopted the current mirror circuitry as the middle amplification stage, and were selected carefully while using the low-noise
transistor for the first rank are +0 the frequency characteristic of 10Hz -
100kHz. -0.2 dB, 0.005% of the distortion, and the property of an SN ratio of
100dB are secured.
The power-source part constituted the
constant-voltage regulated power supply from a L/R independent coil transformer
large-sized as a preamplifier, and has eliminated the cross interferencee
Moreover, the quality of stereophonic reproduction, such
as also using the reed relay of a muting circuit by two L/R independencies, and
also considering it as the special design incorporating the spacer which
suppresses the interference between channels also to a function switch, is
thought as important.
The volume has adopted the attenuator type of 32
steps by which the silver print of the contact was carried out.
control by 22 contact attenuator which achieved the L-R independency is carried
in the flat amplifier output stage.
The silver palladium treatment of the
contact is carried out.
||Equalizer-amplifier part: 2 steps of
differentials current mirror amplification Class-A SEPP
part: 2 steps of differentials current mirror amplification Class-A SEPP
||Phono: 2.5mV/100 ohm, 10kohm, 25kohm,
50kohm, 75kohm, 100kohm
Cartridge load capacity: 100pF, 150pF, 200pF, 300pF,
AUX1, 2, Tape Play:150mV /, 50kohm
|Phono maximum permissible input
||300mV (1kHz, THD 0.01%)
||Tape Rec: 150mV / 1kohm
Output(RL:50kohm): 1V/450 ohm (rate), 20V/150 ohm (MAX)
|THD (20Hz - 20kHz)
||Phono: 0.006% (at the time of 1V output
Volume-20 dB, gain-control 0dB)
AUX: 0.005% (at the time of 1V output
||10Hz-100kHz+0 -0.2 dB
|SN ratio (IHF, A network)
|Phono: 80dB (output 1 V:00)
(output 1 V:00)
|Phono Subsonic Filter
||15Hz, 6dB / oct
|The semiconductor used
||Transistor: 36 pieces
(Electrical Appliance and Material Control Law)
||Power-switch interlock: Three lines
Power-switch un-interlocking.: Two lines
||Width 420x height 81x depth of 357mm