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| Lo-D HMA-9500 |
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| 230,000yen(one-set, around the 1979 time) |
Stereo power amplifier which adopted Power MOS FET.
The first rank constitutes
circuitry from differential amplifier and differential amplifier with which the
2nd step uses a current mirror circuitry as a load intensity.
Properties,
like the mutual conductance of Power MOS FET is large, a linearity and the
frequency characteristic are good, electrical-power gain also has them, and the
complimentary property of N channel and P channel has gathered well, [ large ]It
is simple circuitry of three steps including the power amplification stage.
The capacitor was lost from the inside of a NFB loop, and DC amplifier
stream composition which removed even the input capacitor is adopted.
Moreover, the component partses which cause a tone-quality failure are
eliminated, and the more exact waveform transmission is made possible.
The power transformer was formed in the right-and-left independency at
the power-source part, and the crosstalk is eliminated by considering the
stabilizing supply the rectification smoothing circuit of the power
amplification stage, and for small signals as a right-and-left independent
stream composition.
Furthermore, in order to reduce the interference between
right-and-left channels, the design is carried out by the input/output of the
symmetrical separate placement.
The input pin jack of a gilding
treatment is adopted.
|
| Form |
Stereo power amplifier |
| Circuit system |
Two-step differential-amplification preceding paragraph hardwired-connection
power
MOS FET pure complimentary OCL circuitry |
| Effective output (both channel drive) |
100W+100W (8 ohms, 5Hz - 100kHz)
120W+120W (8 ohms, 5Hz - 20kHz) |
| THD (8ohms) |
0.01% (at the time of 5Hz - 100kHz, and an
Output power)
0.005% (at the time of 5Hz - 20kHz, and an Output power)
0.002% (at the time of 1kHz and an Output power)
0.002% (at the time of
1kHz and 50W output) |
| Cross modulation distortion (60Hz:7kHz=4:1)
|
0.003% (at the time of 8 ohms and an Output
power)
0.003% (at the time of 8 ohms and 50W output) |
| Frequency characteristic |
| DC: |
DC-100kHz+0 -0.5dB
DC-300kHz+0 -1dB
|
| Low cut: |
3Hz-300kHz+0 -1 dB
|
|
| Input sensitivity/impedance |
1V/50kohm |
Channel separation
(Input short-circuit)
|
85dB (5Hz - 100kHz)
95dB (5Hz - 20kHz)
|
| S/N (input short-circuit) |
110dB |
| Dumping factor |
70 (5Hz - 20kHz) |
| The optimal load impedance |
4ohm-16ohm |
| Supply voltage |
AC100V, 50Hz/60Hz |
| Power dissipation |
350W (Electrical Appliance and Material
Control Law) |
| Dimensions |
Width 435x height 192x depth of 410mm
|
| Weight |
28kg |
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