|650,000 yen(one set, the November, 1987 release)
It is the monophonic power amplifier developed towards an audio new time
as first full-scale Oide power power amplifier as a noncommercial use.
Not only a merely big output but the height of the quality of sound is thought as important, the comb of the development technology of an Accuphase is carried out, and the maximum engine performance is pursued.
It consists of
balance systems which made two-set bridge connection of the whole page push pull
drive unit amplifier, and the engine performance is raised.
adopted the balance system with the transmission system only for a plus signal
and a minus signal, distortion generated with amplifier is also canceled in an
output circuit, and takes out a pure signal ingredient at the same time external
noise is canceled theoretically -- it has come to be able to carry out things
Each unit amplifier has adopted gorgeous composition called a
14-parallel push pull, and, as for the output transistor, specification of a
total of 56 pieces is carried out in the collector loss 150W and two units.
Moreover, the large-sized radiator of the aluminum Naked is attached and it
is possible to use it without a heat dissipation fan in the usual state.
It arranges so that every load impedance can take out large electric
power, and an output stage may be changed to the operating state which matched
By changing low load impedance for the switch which changes
impressed electromotive force, the large current of 1100W can be taken out by
1600W or 2-ohm load with 1-ohm load.
In order to improve the quality of
the input magnification circuit of a signal, the Class-A cascode differential
push pull system is adopted as the input stage of all the power amplifier.
Since a cascode circuit is a circuit used for high frequency magnification,
over a large frequency band, operation is stable, and the linearity of an input
also has it, and it has secured the large dynamic range. [ good ]
switching distortion at the time of the Koide power produced in an output stage,
the operating point is strictly set up so that the element of PNP and each NPN
may not be cut off with an incoming signal.
And the preceding paragraph
which drives a final stage has adopted MOS FET equivalent to a non switching
Class-A drive, and, moreover, constitutes it from a cascode push pull. The
preceding paragraph which transfers a signal to this MOS FET is also made into
the Class-A cascode push pull.
This constitutes few stable output stages
distorted from the Koide power of a noise domain to the Oide power of an Output
The power-source part has 2 power-source composition by an independent
transformer. These are connected in parallel and the power-source part
of a total of 3 kVA is constituted.
The power-source impedance
seen from the amplifier side becomes half by this, and maximum dissipation
capacity has become twice.
Moreover, a filter condenser also becomes
equivalent to the power source of 66000micro-Fx2.
The output meter has
equipped peak display type analog meter and the digital meter which displays the
true value of electric power.
An analog form displays an electric power dB
scale and equivalent electric power with a peak value.
detected the voltage and the true value of current which are supplied to the
speaker, found electric power by the analog multiplication part, and has adopted
the system of displaying a true value.
A display digit number is 4 figures
and a range change has five positions of a maximum of 2W, and 200W, 2000W and
10000W. Moreover, hold time serves as four infinite positions for 0.5 second, 3
seconds, and 75 minutes.
The input is equipped with the terminal of a
balance input and an imbalanced input, and these input systems can be chosen
with the switch inside a front sub panel.
Although there is no necessity
for a heat dissipation fan in the state of anticipated use, the fan in the case
where it sets to the bad place of the heat dissipation effect, and the case of
performing the Oide power drive over a long time is an option.
The fan is
considered so that it may be attached inside the sideboard of both sides.
The board of natural persimmon finishing is adopted as both sides.
||Monophonic power amplifier
|Continuation average output
(For 20Hz -
|Normal Load Imp.Operation (0.01% of
|Low Load Imp.Operation (0.05% of distortion)
||1-4ohm load: 0.05%
4-16ohm load: 0.01%
||20Hz - 20kHz, ±0dB (at the time of a
continuation average output level control MAX)
0.5Hz - 150kHz, and +0 -3.0
dB (at the time of 1W output level control MAX)
0.5Hz - 80kHz, and +0 -3.0
dB (at the time of 1W output level-control 6dB)
||Normal Load Imp.Opaeration: 4-16ohms
Load Imp.Operation: 1-4ohms
|Normal Load Imp. Operation
||3.56V (at the time of 8-ohm load and a
continuation average output)
0.12V (at the time of 8-ohm load and 1W output)
|Low Load Imp. Operation:
||1.87V (at the time of 2-ohm load and a
continuation average output)
0.06V (at the time of 2-ohm load and 1W output)
||125dB (at the time of input short-circuit
and a continuation average output)
95dB (at the time of input 1kohm and 1W
|Analog type power output meter
||Logarithm compression peak display type
- 60dB - +3dB, and an output Direct-reading scale
|Digital type power output meter
||The true value display type of electric
||It is a Direct reading about 0.001W-9,990W
by range change.
|Effective digit number
||Less than 2kW : 3% ±5 count
2kW or more
: 3% ±50 count
||0.5 sticks, 3 seconds, 75 minutes, infinity
|The semiconductor used
||99Tr, 13FET, 31IC, 142Di
||100V, 117V, 220V, 240V, 50Hz/60Hz
||At the time of no inputting: 120W+120W
Electrical Appliance and Material Control Law: 600W+600W
At the time of
an 8ohm load Output power: 800W+800W
||the width 481x height 239(piece -- it
includeds) x depth of 489mm
||Fan for heat dissipation O-83 (10,000yen)