Audio Database


165,000yen(October, 1981 release)

The Integrated Amplifier which carries a DUObeta circuit / S.

The DUObeta circuit / S which banished the predrive stage of the power amplifier circuitry are adopted.
The differential cascode received low-noise FET and the parallel push pull input, it connected to the output unit by the parallel push pull of R.E.T. (ring emitter transistor), and the amplifier circuitry which was excellent in nakedness properties including an SN ratio or a distortion is realized.

The Class-A operation area is expanded to 15W by acting to a power part output stage as parallel push pull usage of R.E.T. of a fast-switching property etc., and AB class maximum output has realized 120 W/ch.
Moreover, the Skype fin type heat sink with the high heat-dissipation effect is adopted as a heat sink.

The open loop gain switching type is adopted as an equalizer.
The usual high gain equalizer changes the amount of NFB, changes gain, to supporting MC/man month both cartridges, by L-530, sets a proper quantity of the amounts of NFB as each, and is changing gain by modification of open loop gain.

The phone straight functionality which has priority over other special-NetWare-program sources, and changes to a disk play is carried.
It is possible to use a simple circuitry by jumping to a selector, a light filter, and a balance control, and separating unnecessary product-line leading about.

The tone control fraction can set the turnover frequency of six points as each the object for high regions, and for low-pass.
Moreover, tone control without the noise occurrence and tone-quality transition at the time of tone in is made possible by considering it as the functionality using the NFB circuitry of the power part not using an independent amplifier circuitry.

A block capacitor (the large-sized transformer of capacity 320VA and 30,000 micro F) is adopted as a power-source part, and it is considered as the design which gave the margin.

The warmup indicator is carried, a definite period of time passes after an application of power, and if it goes into the status that it was stabilized also in respect of the tone quality, an indicator will go out.

The improvement in a tone quality is more possible by carrying the line phase sensor, being able to detect the polarity of a domestic AC power source, and unifying a polarity.


Rating of a mode
Form Integrated amplifier
Effective output (both channel operation) Class-A area: 15W+15W (8ohms)
AB class maxima: 120W+120W (8ohms)
THD 0.007% or less (8 ohms, both channel operation, 15W)
Input sensitivity Phono MM:2mV
Phono MC: 125 microvolts
Tuner, AUX, Monitor, Main In: 340mV
Input impedance Phono man month: 100kohm, 50kohm, 100ohms
Phono MC: 300 ohms, 100ohm, 40ohm
Tuner, AUX, Monitor:40kohm
Main In: 47kohm
SN ratio (IHF-A) Phono MM:84dB
Phono MC: 70dB (250-microvolt input)
Tuner, AUX, Monitor, Main In: 110dB
Frequency characteristic 10Hz - -100kHz one dB
Tone control Low-pass turnover: 77Hz, 120Hz, 200Hz, 330Hz, 550Hz, 880Hz
High region turnover: 880Hz, 1.5kHz, 2.5kHz, 4kHz, 6.5kHz, 10kHz
The maximum variation: ±8dB
Tapes monitor Two lines (Tape1, 2)
Tapes dubbing Two lines (1->2, 2->1)
Light filter Subsonic speed: 15Hz
A high cut: 9kHz
Power consumption 380W
Dimensions Width 453x height 161x depth of 444mm
Weight 18.0kg