Audio Database

The

Technics SE-A3
300,000yen(around the 1980 time)

Description
 
Stereo DC power amplifier which is at the top of the new class A amplifier original with technics which canceled switching distortion and crossover distortion.

DC amplifier stream composition which banished all capacitors from the input to the output is adopted.
A bootstrap cascode and a Current-mirror load intensity are added to the differential amplifier of a one chip Dual FET with which the temperature characteristic was equal to the first rank,Then, it has the composition that a differential-amplification double cascode, the voltage amplification stage of a Current-mirror load intensity, the two-step SEPP driver stage of a Class-A, a synchro bias circuit, PP driver of SLPT2 Para, and the output stage of DLPT4 Para come.

The output stage and the power-source part were unified and the concentrated power block which prevents electromagnetic induction is adopted.

The newly developed super audio capacitor (capacity of 22,000 micro F) is adopted as an electrolytic capacitor a total of both four ch(es).
As for this capacitor, compared with the former, an impedance of 12dB is improved at 7dB and 1MHz by the mid range.

DLPT (dual linear power transistor) of the twin structure which made SLPT of high fT 2 stone one puck of NPN and PNP is developed newly and carried in the output transistor. The current wave form which comes out from the power stage by this realized a property which finally becomes the same as the wave of a Class-A operation, and has improved especially the high region property greatly.

The busline of three-layer sandwich construction is adopted and the distorted occurrence by electromagnetic induction is minimized.

The monophonic construction of the right-and-left full independence by two transformers is adopted.

Large-sized and a high precision peek power meter are carried.

The protection network by the auto-return type relay equipped with the indicator is carried.

Concentrated DLPT
Concentrated power block

Rating of a mode
Form Stereo DC power amplifier
Effective output (20Hz - 20kHz, 0.002%) 200W+200W (8ohms)
THD 0.001% (20Hz - 20kHz, Output-power-3dB o'clock)
TIM distortion Incapable measurement
Output bandwidth 5Hz - 100kHz (T. H.D.0.007%)
Frequency characteristic DC-20kHz+0 -0.1dB
DC-300kHz+0 -3dB
SN ratio (IHF-A) 123dB
Remains noise 150 microvolts
Dumping factor 120 (8ohms)
Load impedance main or remote: 4ohms - 16ohms
main and remote: 8ohms - 16ohms
Input sensitivity/impedance 1V/47kohm
<Meter property>
Indicating range 0.0001W-300W (8ohms)
- 60dB - +5dB
Frequency characteristic (indication precision) 10Hz-10kHz±1dB (less than [ -40dB ])
10Hz-20kHz±1dB (more than -40dB)
Attack time 50microsec
Recovery time 750msec (0dB->-20dB)
<Synthesis>
Power source AC100V, 50Hz/60Hz
Power consumption 560W
Dimensions Width 430x height 208x depth of 507mm
Weight 35.2kg