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| Technics SE-A5 |
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| 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.
|
| 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%) |
|
| THD |
| 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 |
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