Stereo power amplifier which adopted MOS FET as an element for electric power magnification, concentrated Accuphase technology, and elaborated the engine performance and sound quality.
It is considered so that it may operate with pure Class-A amplifier by change.
The Class-A operation method is an operation method which the domain of a push pull element of operation always overlaps completely.
A change of operation does not change bias resistance of a circuit with a switch, but the pure electronic formula switch (PAT, PEND) is performing it.
In the output stage, MOS FET consists of parallel push pulls.
Since MOS FET does not generate notching distortion at the time of transmission of high frequency, it has improved the high region characteristic. Moreover, the effect is obtained also for the improvement of a harmful TIM distortion.

All the magnification stages consist of original symmetrical type push pulls of an Accuphase.
base -- it excelled in the characteristic, especially a linearity, the ultimate low distortion could be realized by a little NFB, the high magnification circuit of stability was constituted, and, as a result, sound quality has improved by reduction of IM and TIM.
Moreover, in order to remove a coloration, it has direct-current composition which removed the condenser also from the NFB loop. For this reason, direct-current drift of the output to produce is stabilized by using a dual element for an input differential circuit, and making it a stable layout to a temperature change.

High efficiency low leakage flux type CI core is adopted as a power-source part.
This CI core was the same as the form currently used for the column top transformer of the intense home power source of load fluctuation, made winding wire 2 division balance volume, and has also improved efficiency and rate of change.
Two pieces 40000-micro F are adopted as a filter condenser. The low impedance design especially of this condenser is carried out as an object for audios.

It has come to be able to carry out the Direct reading also of the output in 8-ohm load with dB scale in logarithm compression type peak level meter.
Moreover, a peak hold is possible by a maker function changeover switch. Since the peak which hold time is about 3 seconds and is produced in the meantime is held, the peak surveillance of program sauce is possible.
In addition, at the time of Class-A operation, it changes automatically with an Operation switch so that Output power 30W may be set to 0dB.

In order to be able to control the gain of amplifier according to total efficiency also including a speaker, the Attenuator for input level adjustments is prepared.
Variable is possible at a -20dB to 1dB step at right-and-left independence.

In order to correspond to generation of heat by Class-A operation and to maintain durability over a long period of time, if an air temperature inside the plane becomes 70 degrees C, bias will be controlled automatically, and the sensor which prevents overheating is built in.
Moreover, in the usual operation (Normal Operation), it worked so that the service voltage to output FET might be controlled, and overheating is prevented similarly.