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| Pioneer M-75 |
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| 135,000yen(around the 1980 time) |
Stereo power amplifier which aimed at obtaining generous high power
after aiming at a distorted reduction.
The first rank differential
current mirror load-intensity, three-step Darlington, parallel push pull, and
pure complimentary OCl circuitry is adopted as a circuitry.
Furthermore, the
flat phase response has been obtained from the NFB circuitry over the wide band
by having DC amplifier stream composition which removed the capacitor.
In order to eliminate the cross interferencee between right-and-left
channels, it is the design which separated the circuitry of the right-and-left
channel structurally. Moreover, the power-source part by large-sized L/R
independent 2 power transformer and the mass capacitor of 22,000 micro Fx4 is
carried in the power-source part, and sufficient consideration also for leading
about of an internal wiring is carried out.
In 20mm and thickness, width is using a 2mm pure-copper board for the grounding
product line from a capacitor. Moreover, a resistance value adopts as the
hot side the 14th track (2.03phi Yori line) of the very thick set to one
fourth of the conventional thick lines. The Copper foil of a substrate
also achieves low-impedance-ization, such as doubling with 70micro, and
is raising banishment of an electrical-power loss, and the response to
a steep pulse.
The
power meter which can carry out the Direct reading of the musical peaking
capacity in a watt is adopted.
It is displayed to 0.01W-300W (8ohm), and since it is with a logarithmic
comression circuitry, the Direct reading of the output can be carried out
without a change.
The input level controller of L/R
independent a step of 1dB and the speaker circuit changing switch which can
perform the change of Off, A, B, and A+B are carried.
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.JPG)
| Form |
Stereo power amplifier |
| Circuit system |
3 steps of first rank differential current
mirror load-intensities Darlington parallel push pull
Pure complimentary OCL
circuitry (DC amplifier stream composition) |
Effective output
(Both channel drive, 20Hz - 20kHz) |
180W+180W (4ohm)
150W+150W (8ohm) |
THD
(20Hz - 20kHz, 8ohm) |
At the time of an effective output: 0.01%
At the time of 75W output: 0.01%
At the time of 1W output: 0.01%
|
Cross modulation distortion
(50Hz : 7kHz = 4:1 or 8ohm) |
At the time of an effective output: 0.01%
At the time of 75W output: 0.005%
At the time of 1W output: 0.005%
|
| Output bandwidth (IHF, both channel drive) |
5Hz - 35kHz (0.01% of distortion)
5Hz -
60kHz (0.05% of distortion) |
| Frequency characteristic |
5Hz-100kHz+0 -1dB (at the time of 1W output)
|
| Input terminal |
Input: 1V/50kohm |
| Output-terminal |
A-B: 4ohm-16ohm
A+B: 8ohm-16ohm
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| Dumping factor |
100 (20Hz - 20kHz, 8ohm) |
| SN ratio |
115dB (IHF, A network, a short circuit)
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| The semiconductor used |
IC: Two pieces
Transistor: 61 pieces
Diode, other:65 piece |
| Supply voltage |
100V, 50Hz/60Hz |
Power consumption
(Electrical Appliance and Material Control Law) |
330W |
| Maximum electric power consumption
|
900W |
| AC outlet |
Un-interlocking.: One line |
| Dimensions |
Width 480x height 187x depth of 445mm
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| Weight |
24.5kg |
| EIA specification rack mounting unit
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4U |
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