
Accuphase E-406 |
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380,000 yen(June, 1993 release) |
The Integrated Amplifier which the Accuphase concentrated the
development technology cultivated for years by the separate amplifier group,
made the preamplifier part and the power amplifier part become independent
completely, and was developed as a form of the ideal of integrated amplifier.
a power amplifier part -- an output stage -- 4 -- it constituted from a
parallel output element, this was attached to the large-sized heat sink, and the
operational stability also corresponding to low impedance load has been
obtained.
In order to prevent output offset voltage (phenomenon which a part
flowed in one direction leaks to an output), by using an Accuphase and original
direct-current servo amplifier for NFB (return circuit), a speaker output was
not made to generate a part flowed in one direction, but operation stabilized
also in power source variation or a temperature change has been obtained.
The input circuit is constituted from an Accuphase original differential
complimentary push pull circuit, and has realized high CMRR (this phase
ingredient removal ratio).
This differential part is the push pull amplifier
of emitter grounding by which Darlington connection was made, and the signal is
led to the driver part of an output stage. By push pull composition symmetrical
with the bottom of besides, high operational stability is made possible.
The transformer of power amplifier / preamplifier part independence was
used for the power-source part, and the mutual intervention between amplifier is
completely prevented by using an exclusive power source, respectively.
The
thing of the heavy weight class which amounts to 9kg is adopted as the power
transformer for power amplifier, and the mass capacitor of 33,000 micro Fx2 is
adopted as smooth.
The large-sized speaker terminal which can respond also to a very thick cable and which began to delete brass Naked material is adopted as a speaker terminal. This terminal also supports the banana plug.
Furthermore, bi-wiring connection is also supported by choosing an A+B
position.
The large-sized power meter which can monitor output electric
power is carried.
this meter -- logarithm compression -- it is possible to
supervise correctly the music signal which changes since a large dynamic range
can be seen at once since type, and it moreover supplements with a peak.
The line amplifier part is constituted from a discrete part, and basic
composition is the original of an Accuphase, and a differential pure complimentary
push pull, prepares a single ended push pull type emitter follower in an
output stage, and is considered as simple composition. Phase compensation
of each stage also became light by this, and more natural sound quality
has been obtained.
Moreover, the cross talk from a main power supply is coped with
using a local active ripple filter power source.
The composition
equipped with the input circuit in consideration of the characteristic of the
cartridge of each MC type / MM model for exclusive use is adopted as an
equalizer amplifier part.
At the time of MM input, it constitutes from an
FET element which can maintain high input impedance over all the circumferential
fraction zones in consideration of an Output voltage and an Output load
impedance being high. Moreover, at the time of MC input, since a minute signal
is received by low impedance, little reproduction of noise is enabled by a low
noise element's constituting a difference input circuit, and attaining low
impedance-ization of a NFB loop.
The golden plate is adopted as the
print board of main signal courses, in order to raise the purity of circuit wire
connection and to aim at improvement in sound quality.
Copper of high purity
is used for the printed circuit board, by performing golden plate-ization on
this, the influence of a skin effect was reduced and the good degree of electric
conduction has been obtained.
Since a straight signal course is
constituted at the shortest, the change installed the relay in the required
place and has adopted the logic relay control which controls these relays
electronically.
The encapsulated type relay containing nitrogen gas for
communication industry is adopted as the relay used for this. This relay contact
has acquired low contact resistance and quantity durability by the plated with
gold and the crossbar twin system.
Tone control of the added type active
filter system used for a full-scale graphic equalizer is developed and carried
in the tone control part.
By this system, it passes straight, if needed, an original flat signal is another, makes the characteristic, is a system adjusted from a flat signal, and serves as a system which excelled the conventional tone control in the field of sound quality.
The remote commander in whom an
input change and volume control are possible is attached.
Since the input
selector has adopted the system which changes a relay electronically, it is
controlling this logic circuit by a commander, and there is no degradation of sound quality.
Furthermore, especially, the adjustor of an input level
adopts the small resistance object of a distortion, is considering it as the
type which this resistance object rotates, attaches a gearing system and an
electric motor to this, and supports remote control. The magnetic shield is
given to the exterior covering of this motor with the silicon steel plate, and
the influence by noise is reduced.
Since the micro computer is used and the
timing of a change is controlled to the milli second (ms) order, there is no
generating of change noise.
The balance input is carried.
In balance
transmission, the sending side transmits simultaneously the signal of the plus
which the phase reversed 180 degrees on the same voltage, and minus, and, in
response, the receptacle side is correctly compounded with + amplifier and -
amplifier. It will be canceled if compounded, and only the amount of noise
disappears, and the purity of a music signal goes up the noise ingredient
generated in a cable at this time in order to go into two poles at this phase.
The amplifier only for headphone is formed and sound quality is
considered.
A preamplifier part and a power amplifier part are separated
and the changeover switch and its input-and-output terminal for using it as
independent amplifier are carried.
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Form |
Integrated stereo amplifier
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Continuation average output (both channel operation)
20Hz - 20kHz, 0.02% of a distortion |
250 W/ch (4ohms)
170 W/ch (8ohms)
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THD (both channel operation)
0.25W - a
continuation output, 20Hz - 20kHz |
0.02% (4ohms - 16-ohm load)
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IM distortion |
0.01% |
Frequency response |
Main amp input: |
20Hz-20kHz+0 -0.2dB (at the time of an
Output power)
2Hz-150kHz+0 -3.0dB (at the time of 1W output)
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High Level input: |
20Hz-20kHz+0 -0.2dB (at the time of an
Output power) |
Low Level input: |
20Hz-20kHz+0.2 -0.5dB (at the time of an
Output power) |
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Dumping factor |
120 (8-ohm load, 50Hz) |
Input sensitivity/impedance
(An Output
power / EIA1W output) |
AD input(MC): 0.15mV/0.011 mV/100 ohms
AD input(MM): 4.65mV/0.35mV/47kohm
High Level input:
147mV/11.2mV/20kohm
Balanced input: 147mV/11.2mV/40kohm
Main input:
1.47v/112mV/20kohm |
The Disc maximum input
(Rec out, 1kHz,
0.005% of distortion) |
MM:300mVrms
MC:8.0mVrms
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An Output power/impedance |
Pre output: 1.47V/50 ohm
Tape Rec
output: 125mV/200 ohms (AD) |
Gain |
Main input -> output: 28dB
High Level
input -> Pre output: 20dB
AD input (MM) -> Tape rec output: 30dB
AD input (MC) -> Tape rec output: 60dB |
S/N, input conversion noise |
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Input short-circuit
and A-compensation |
EIA S/N
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At the time of a rated input
S/N |
Input conversion noise
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Main amp input: |
130dB |
-127dBV |
108dB |
High Level input: |
113dB |
-130dBV |
84dB |
Balanced input: |
90dB |
-108dBV |
84dB |
AD input(MM): |
90dB |
-137dBV |
80dB |
AD input(MC): |
75dB |
-151dBV |
80dB
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Tone control |
Low-pitched sound (300Hz): ±10dB (50Hz)
Loud sound (3kHz): ±10dB (20kHz) |
Loudness Compensation |
+ 6dB (100Hz, Volume-30dB) |
Subsonic Filter |
17Hz, -12 dB/oct |
Power meter |
Logarithm compression type peak level
display
dB scale and the output Direct reading at the time of 8-ohm load
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Load impedance |
4ohm-16ohm |
Headphone jack |
Conformity impedance: 4ohms - 100ohms
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Power source |
AC100V/117V/220V/240V, 50Hz/60Hz
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Power consumption |
65W (at the time of no inputting)
390W
(Electrical Appliance and Material Control Law)
620W (at the time of an
8-ohm load Output power) |
The maximum Dimensions |
Width 475x height 180x depth of 423mm
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Weight |
28.0kg |
Attachment: Remote commander RC-10
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Remote control system |
Infrared pulse system |
Power source |
DC 3V |
Battery |
UM-4 (an IEC name, R03), two pieces
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The maximum Dimensions |
Width 66x height 175x depth of 20mm
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Weight |
190g (Battery includeds) |
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