Audio Database


80,000yen(around the 1976 time)

Control amplifier developed based on the amplifier technology cultivated for years.

The circuitry of an equalizer part is 7 stone stream compositions by one step of difference input with a constant current load circuit, and the final stage has adopted the pure complimentary Class-A push-pull circuit.
Moreover, the transistor with few noise figures selected carefully was used, and the high operation of stability has been obtained over the wide band.
Furthermore, the RIAA deflection rectified in a flat property as a convention has adopted NF elements, such as a metal film resistor with little error, and a styrene capacitor, with the high order accuracy.

Input terminals are carried in the right-side side-panel side, and it has adopted the unique structure where an input terminal fraction, an equalizer substrate, and an input multiple contact switch approach.
Moreover, the shielding wire constituting the cause of a failure of a high region property is reduced, and the SN ratio is improved.

Three-step switching is possible for Input sensitivity and an input impedance so that a Phono input circuit may be equipped with two circuitries and the performance of a cartridge can be pulled out.

In addition to the usual tone control, the coordination of inside compass has also adopted the triple tone control original with a possible SANSUI as a tone control.
Circuitry has obtained operational stability for one step of differential by the 2 steps of includeds amplifying circuit including the flat amplifier of the preceding paragraph. Moreover, low and the tone control circuit for loud sounds are made to become independent of the object for the inside compasses of a mid range, respectively, and it is made to operate with exclusive amplifier.
Furthermore, the turnover-frequency switchover which can perform tone control over a larger span is carried, and it can change to three steps of low-pass and a quantity region each.
A tone control circuit can be bypassed with a defeet switchpoint.

The sharp active type of a barrier property is adopted as a low filter using a low-noise transistor. A selection of two-step switching is possible for a barrier property.
Moreover, by an out position, a signal is bypassed not passing through a filter circuit.

Two-step switching is possible also for a high filter like a low filter.
They are able for damping curves to differ, respectively and to use properly according to noise statuses, such as tape hiss in a high region, and a scratch noise. Moreover, by an out position, a signal is bypassed not passing through this filter circuit.

Two tape decks can be used and a tapes play functionality and a tape-copy functionality can perform them independently, respectively.
Moreover, when not using the deck, it has an off-position for the decks and the electric influence by the load impedance of the deck are connected can be prevented.

The succession good transformation highly precise 4-unit volume is adopted as a volume.
Moreover, since a this 4-unit type volume is a scheme narrowed down by both by the side of an input and an output, there are few remains noises and they are improving the practical SN ratio.

In order to operate each circuitry stably, the regulation has adopted the power transformer which is good and has little leakage magnetic flux.
The low stabilized power source of source impedance is adopted, and }2 power source is supplied to all the circuitries.

- Carry an audio muting switch of 20dB.

The tuner multiple contact switch which can be chosen by one-touch control is carried.

The mode switch of a stereo / reverse / L+R/L/R

The pre-out selector is carried in the front panel.

The amplifier only for headphone is built in.

The muting circuit which erases the it1 noise at the time of power-source on-off is built in.

Side Internal
4-unit Power-source

Rating of a mode
Form Stereo control amplifier
Output voltage (Output power) Preamplifier output: 1V
Sound-recording output (Pin/Din): 150mV/30mV
Maximum output voltage (1kHz) 12V (less than THD 0.1%)
THD (Aux) 0.03% or less
Cross modulation distortion (Aux, 70Hz:7kHz=4:1, SMPTE) 0.03% or less
Frequency characteristic (Output power) 10Hz-80kHz+0.5 -1 dB
RIAA deflection (20Hz - 20kHz) }0.2dB
Channel separation (an Output power, 1kHz) 60dB or more
SN ratio (IHF, A network, a short circuit) More than Phono1:75dB
Aux, Tape mon: 90dB or more
Input sensitivity/impedance (an Output power, 1kHz) Phono1:2mV, 4mV, 8mV / 30kohm, 50kohm, 100kohm
Aux, Tuner, Tape play:150mV /, 50kohm
Phono maximum permissible input 1000mV (1kHz, THD 0.1%, Input sensitivity of 8mV)
Tone control Bass: }10dB (30Hz)
Midrange: }5dB (1.5kHz)
Treble: }10dB (20kHz)
Tone selector Bass: 600Hz, 300Hz, 150Hz
Treble: 2kHz, 4kHz, 8kHz
A low filter - 3dB (20Hz), 12dB / oct
- 3dB (60Hz), 12dB / oct
A high filter - 3dB (7kHz), 6dB / oct
- 3dB (12kHz), 12dB / oct
Muting -20dB
Power dissipation 20W
Dimensions Width 460x height 176x depth of 345mm
Weight 9.9kg