|200,000yen(around the 1980 time)
The performance of amplifier is the stereo power amplifier developed by
the basis of the design concept of a "magni-wide power range" that a full power
play must be able to be carried out in a low distortion not only over the inside
of an audio frequency band but over a super-wide band.
In order to
enable the low-distortion full power play in a super-high region, ensemble
transistor RET excellent in the high region switching characteristic is
developed and adopted.
It carries the large-sized power-source part by
the large-sized transformer of a L-R independency, and the capacitor of 22,000
micro Fx4 in order to die and to make it go over sufficient power while
super-low-pass one improves a property with DC amplifier.
Even 3W is
reproduced in a Class-A operation, and AB class operation is carried out with
the output beyond it.
Since the utilization factor of an electrical power is
a high efficiency near common B class amplifier, the peek component of a music
signal also has allowance and it is being reproduced.
stream composition which eliminated the capacitor of the NFB circuitry is
Since the low-pass phase shift which the capacitor in a NFB loop generates
owing to is canceled by this, stable NFB can be applied.
Since low-impedance-ization inside amplifier is put into practice, width
is using the pure-copper board which are 12mm and 1mm in thickness for
the grounding from an electrolytic capacitor to a speaker termination.
the resistance value has adopted as the hot line from a rectifier to a speaker
termination the 14th track (2.03phi Yori line) of the very thick set to one
fourth of the conventional thick lines.
Furthermore, the Copper foil of the substrate was doubled in 70micro, and, as for 12mm and thickness, width has connected the collector of two power transistors with the short bar of a 1.2mm pure-copper board.
The mono-construction specification which
suppressed the separation between right-and-left channels has attained the high
Gilding excellent in the corrosion resistant is given to the
||Stereo power amplifier
||3 steps of first rank differential current
mirror load-intensities Darlington
Parallel push pull pure complimentary OCL
(AB class operation, DC amplifier stream composition)
|Effective output (both channel drive)
||120W+120W (5Hz - 30kHz, THD 0.01%)
120W+120W (5Hz - 80kHz, THD 0.05%)
||120W+120W (5Hz - 20kHz, THD 0.02%)
(5Hz - 30kHz, 8ohm)
|At the time of an effective output: 0.01%
At the time of 60W output: 0.01%
At the time of 1W output: 0.007%
|Cross modulation distortion
(50Hz : 7kHz = 4:1 or 8ohm)
|At the time of an effective output: 0.006%
At the time of 60W output: 0.005%
At the time of 1W output: 0.005%
(IHF, both channel drive)
|5Hz - 45kHz (0.01% of distortion)
100kHz (0.05% of distortion)
||5Hz-200kHz+0 -1dB (at the time of 1W output)
||Speaker: 4ohm - 16ohm
||100 (20Hz - 20kHz, 8ohm)
|SN ratio (IHF, A network)
|The semiconductor used
||Transistor: 55 pieces
||280W (Electrical Appliance and Material
|Maximum electric power consumption
||Width 420x height 153x depth of 370mm