Audio Database


Technics SE-A5
150,000yen(around the 1980 time)

Stereo power amplifier which inherited the thought and the quality of SE-A1 and SE-A3, and also carries a linear feedback circuit.

The linear feedback circuit is newly carried in the new class A scheme which consists of a synchro bias circuit and a concentrated power block.
The essence of the multiplex feedback-circuit technology was rendered, it was developed, an independent period circuitry which makes nakedness amplification degree =infinity of amplifier possible into a NFB loop is formed, and this circuitry is as a theoretical value,The speaker drive without the influence of pure gain and counter-electromotive force without the influence of distortion =0, an element, or a power source, or a wire rod is realized.

The synchro bias circuit is carried, in B class operation, synchronizing with the pause cycle, the fixed bias was supplied to + side - side each output transistor which stops by turns, and switching distortion is always canceled for the output stage in an active state to it.
Furthermore, in order to make the signal path and the bias-current path become independent, the output stage saves the suitable operating point and work of high-speed diode with square-law characteristics has canceled crossover distortion conjointly.

The output stage and the power-source part were unified with the skillful stream composition, and the concentrated power block which cut off the ill effect of electromagnetic field from the origin is adopted.
Furthermore, the external induction is suppressed by using the high magnetic substance of the shielding effect for a chassis, a cover, etc.

A 10,000-micro F electrolytic capacitor is employed full time as a power-source part four times.

the output of 30W when the output change-over switch of full (120W+120W) and limited (30W+30W) is carried and a perimeter is quiet -- a huge power source -- a margin -- the method of the fully driven pleasure can be done.
At the time of a limited selection, a meter illumination is also set to being turned off and power consumption also becomes small.

If the protection network of a pure electronic formula is carried and DC component may occur for a speaker termination, a speaker will be separated by relay.
Moreover, this circuitry operates also to the amplifier protection at the time of becoming short-circuit and the unusual low-impedance load intensity of a speaker termination.

The large-sized power meter which can carry out a Direct reading without a range change from 0.0001W to 300W is carried.
The response is based on the property of VU meter of BTS specification.

Rating of a mode
Form Stereo power amplifier
Output power (20Hz - 20kHz)
At the time of full : 160W+160W (4 ohms, 0.003%)
120W+120W (8 ohms, 0.002%)
At the time of limited : 40W+40W (4 ohms, 0.003%)
30W+30W (8 ohms, 0.002%)
At the time of an Output power : 0.003% (20Hz - 20kHz, 4ohms)
0.002% (20Hz - 20kHz, 8ohms)
At the time of a rated-3dB output : 0.001% (20Hz - 20kHz, 8ohms)
0.0005% (1kHz, 8ohms)
TIM Incapable measurement
Power bandwidth 5Hz - 100kHz (THD 0.007%)
Frequency characteristic DC-20kHz+0 -0.1dB
DC-200kHz+0 -3dB
SN ratio 123dB
Remains noise 100 microvolts
Dumping factor 140 (8ohms)
Load impedance Main or Remote: 4ohms - 16ohms
Main & Remote: 8ohms - 16ohms
Input sensitivity/impedance 1V/47kohm
Power output meter indicating range 0.0001W-300W
- 60dB - +5dB
Supply voltage AC100V, 50Hz/60Hz
Power consumption At the time of full: 330W
At the time of limited: 100W
Dimensions Width 430x height 178x depth of 416mm
Weight 18.4kg