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| Technics SE-A3 |
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| 300,000yen(around the 1980 time) |
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.
|
.JPG) |
.JPG) |
| Concentrated power block |
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| 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
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| 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
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| Weight |
35.2kg |
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