Audio Database


135,000yen(September, 1981 release)

The Integrated Amplifier which carries a DUObeta circuit / S.

A DUObeta circuit / S is adopted as a power part, and it has become a description almost equivalent to L-530 in circuitry.
The input of the power part was made into the parallel connection of high gm and low-noise FET, after giving the large current and obtaining all required gain, the predrive stage was banished, and also "proper-quantity NFB" and "DC servo" were prepared, and the tone quality is finished.

A Class-A operation area is expanded to 8W, and most usual listening level is covered with a Class-A operation.
Moreover, by AB class, the maximum output 100W is realized and it corresponds also to the Taishin number input which starts rapidly.
An output stage adopts R.E.T. and is taken as parallel P.P.

an equalizer part changes an open loop gain -- the object for MC, and the object for man month -- a proper quantity of NFB cars are determined as each, and it has composition which can be said also as two exclusive equalizers.
High gm and low-noise FET developed in MC head amplifier are adopted as an input by the parallel differential amplification, and not only an SN ratio but distortion, a tone quality, etc. are raising completeness all fields.

With a switchpoint, the phone straight functionality which changes to a disk first priority is carried.
Product-line leading about to contacts, such as a selector, a light filter, a balance control, etc. is separated, and a pure disk play is possible.

A tone control fraction is selectable about six points at each the object for high regions, and for low-pass. It can ask for a favorite tone quality.
Moreover, since it was not considered as the independent amplifier circuitry but the NFB circuitry of a power part is used, neither a noise occurrence nor a failure of a tone quality is caused.

The large-sized transformer of capacity 300VA and the block capacitor of 15,000 micro Fx2 are adopted as a power-source part.
Moreover, the thing equivalent to L-530 is adopted as the heat sink of the Skype fin.

The warmup indicator is carried, time and a temperature are detected as a warmup being completed, an indicator goes out, and it can check having gone into the status that it was stabilized also in respect of the tone quality.

The recording switchpoint is carried, and if a switchpoint is pushed, it can record with two tape decks.
Usually, Rec Out is separated and a tone-quality failure is not caused.


Rating of a mode
Form Integrated amplifier
Effective output (both channel operation) Class-A area: 8W+8W (8ohms)
AB class maxima: 100W+100W (8ohms)
THD 0.007% or less (8 ohms, both channel operation, 8W)
Input sensitivity Phono MM:2mV
Phono MC: 125 microvolts
Tuner, AUX, Monitor, Main In: 310mV
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: 67dB (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 365W
Dimensions Width 453x height 161x depth of 444mm
Weight 17.3kg