||a price point -- unknown (1970
The preamplifier which succeeded the amplifier
technology of C28 and C32.
An input selector is used as a double silver
contact, and is structurally made strong.
Moreover, the operation of the
network shielded in each high-level input and the short switchpoint which
grounds an unnecessary input is kept from a signal being fed back between input
Newly developed IC and OP amp were carried in the Phono
equalizer, and low-distortion low-noise-ization of a difference input circuitry
is realized to it.
In order to fully demonstrate the low-noise effect, the
part with little error is adopted as a feedback circuit.
IC headphone amplifier of 0.1% or less of a distortion is developed and adopted as headphone amplifier.
It makes it possible to operate dynamic type headphone to a
A sound volume can be adjusted in the volume only for
The switching is using the push-button and, as for picking,
the switchpoint is directly attached to the printed circuit board.
input/output circuitry to each tape deck is shielded, it removed the
direct-current leakage from a partner's tape deck, and has reduced the pop noise
generated at the time of a switching, and the it1 noise.
high precision step type Attenuator of a mac company is adopted as volume
It consists of the controls and Volumes OFF which divided a span of
70dB into 32 steps.
A loudness control is controllable with the "Loud"
thumb on a succession variable target.
In order that a power transformer
may remove a hum and may raise an SN ratio, it is shielded by Mie with a
copperplate, a silicon-steel board, and metal casing.
In the Output voltage
of 24V, by a 3,000-micro F capacitor, monitor amplifier is supplied, and the
voltage by which full wave rectification was carried out pressures 18V partially
from this Output voltage, and supplies a voltage stabilizer and an OP-amp
circuitry through IC voltage control circuitry.
By the feeling ability
outlet circuit of an electric current (SCR adoption), if the player operates,
the power source of a preamplifier will also be in ON status.
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 itself.
||20Hz-20kHz+0 -0.5 dB
||0.02% or less (at the time of 20Hz - 20kHz, and an Output power)
||Phono1, 2:2mV (1kHz) / 47kohm (65pF)
AUX, Tuner, Tape1, 2:0.25V/250kohm
MIC: 2.5mV / 500kohm
|A hum and a noise
||AUX, Tuner, Tape1, 2:IHF 100dB, 90dB (with
no auditory sensation weighting)
Phono1, 2:IHF 90dB, 80dB (at the time of a
|An Output voltage/impedance
||Main output: 2.5V / 10kohm (at the time of a
Tape output: 0.25V / 10kohm (at the time of a rated input)
Headphone and Line output:0.75V (8ohms), 2.5V/600 ohm
|line feed character-HF filter
||50Hz or less, 7kHz or more (12 dB/oct)
|Voltage amplification (decibel)
|AUX, Tuner, Tape1, 2 :
|Phono1, 2 :
|The semiconductor used
||Transistor: Two pieces
IC: Nine pieces
Silicon diode: 11 pieces
light emitting diode: Eight pieces
LDR: One piece
||+ 20dB--20dB (20Hz), an 11-step switching
||+ 18dB--18dB (20kHz), an 11-step switching
||0dB--70dB, a succession variable
||Main unit: Width 375x height 122x depth of
330mm (pan nowait-lock included)
Front panel: Width 406x138mm in height
||8.6kg (at the time of an original packaging: