||a price point -- unknown (1970
The preamplifier born from traditional craft Manship
who does not allow compromise.
The output of 12W+12W is obtained to a loudspeaker connecting terminal
on the back, and a drive of an X-tend speaker system is also possible by
the combined use with an input selector switch.
Moreover, a front headphone jack can be driven also by a dynamic type and
capacitor type, and carries the volume for exclusive use.
FET is used
for all the input changeover switches.
FET is made to turn on and off on
minute DC voltage, and the frequency characteristic is not affected, but the
occurrence of the switching matter noise is suppressed.
special-NetWare-program equalizer defeet switchpoint is carried.
coordination of ±12dB is possible focusing on each frequency of 30Hz, 150Hz,
500Hz, 1500Hz, and 10000Hz.
It is also possible the sound recording of
an FM broadcast and to monitor independently, respectively, making the
changeover switch only only for a play and for a sound recording become
independent, respectively, carrying it, and playing a record.
logarithm expander circuitry is carried, and noises, such as a hum, hysterics, and a scratch, are decreased at the same time it expands a dynamic range in
logarithm and rectifies it.
It is indicating by the function and the
operating state of each push-button switchpoint of the front panel is shown by
red light emitting diode.
By a power-source interlock outlet circuit (SCR adoption), if the player
operates, the power source of a preamplifier will also be automatically
set to ON. Moreover, if a player is come by off, a power source will also
be in an OFF status.
It is also possible to
turn OFF this functionality.
In order that a power transformer may
remove a hum and may improve an SN ratio, the Mie shielding is carried out with
a copperplate, a silicon-steel board, and metal casing.
It is rectified with
24V Output voltage, and monitor amplifier is supplied.
Moreover, 18V is
pressured partially from an Output voltage, and the voltage stabilizer and the
OP-amp circuitry are supplied through IC voltage control circuitry.
low-noise transistors of a low impedance are used for a Phono equalizer
In order to demonstrate this low-noise effect, a 68-ohm feedback
circuit is adopted.
All of a loudness circuitry, an equalizer, and a
band pass filter consist of ionic bond type electrolysis differential amplifier
The special relay is carried in order to remove the Tran Gent
event produced by ON/OFF of a power switch.
This relay operates with a
transistor switchpoint and sends the output of a preamplifier to an
The long capacitor of a time constant and a short capacitor
are built into a transistor switchpoint,after a power source is set to ON by the
former capacitor, a signal is set to ON in about 2 seconds, and a power source
is come by off by the latter capacitor -- the relay is controlled so that a
signal is come by off in front for a while.
||20Hz-20kHz+0 -0.5 dB
-0.5dB (at the time of Equalizer OFF)
||0.05% or less (at the time of 20Hz - 20kHz, and an Output power)
||Phono1, 2:2mV / 47kohm (65pF)
Tuner, Tape1, 2 or 3:250mV / 50kohm
|A hum and a noise
||AUX, Tuner, Tape1, 2, 3:IHF 100dB, 90dB
(with no auditory sensation weighting)
Phono1, 2:IHF 90dB, 80dB (with no
auditory sensation weighting)
|An Output voltage/impedance
||Main output: 2.5V / 5kohm (at the time of a
Tape output: 0.25V / 5kohm (at the time of a rated input)
|A monitor, headphone, and a line output
||12W+12W (8 ohms, 20Hz - 20kHz, 0.1% of
5Vrms (a 600-ohm line, with a level control)
||30Hz, 150Hz, 500Hz, 1500Hz, 10000Hz
octave each frequency bands (a 12dB boost and cut)
|line feed character filter
||A flat and -12 dB/oct. (50Hz or less)
||A flat and -12 dB/oct. (7kHz or more)
(decibel, an equalizer, and a filter are flat locations)
||Tape1, 2, 3
|AUX, Tuner :
|Tape1, 2, 3 :
|The semiconductor used
||Transistor: 67 pieces
IC: 35 pieces
Diode: 62 pieces
FET: Two pieces
Silicon rectifier (SCR): One piece
|AC plug socket
||Automatic ON/OFF plug socket (green): Two
Switchpoint type plug socket (black): Four lines
||Main unit: Width 381x height 127x depth of
330.2mm (pan nowait-lock included)
Front panel: Width 406.4x138.1mm in
||11.79kg (at the time of an original