Accuphase E-460 매뉴얼 - 페이지 2
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페이지 인쇄
The successful and long-running E-400 series
from Accuphase has garnered high praise both
in Japan and abroad and is widely regarded as
the pivotal line of high-end integrated
amplifiers. The E-460 represents a model
change from the popular E-450. It incorporates
the sophisticated technological know-how
gained by Accuphase over the years, and
features a further refined AAVA volume control.
It also marks a return to MOS-FET devices in
class A/B integrated amplifier from Accuphase.
Latest circuit topology and strictly selected
parts bring out the hidden potential in each
music source. Rediscover the joys of music
with this high-class integrated amplifier.
AAVA is a revolutionary principle that redefines
the concept of volume control from the ground
up. Unlike the digital approach involving A/D
and D/A processing, it operates purely in the
analog domain for high performance and
ultimate sound. Because the amplification and
volume control tasks are integrated in a single
electronic entity without any variable resistors,
performance and sonic purity do not deteriorate
over the years, providing excellent reliability.
The power amplifier section is built as an
advanced instrumentation amplifier, which
enables fully balanced signal transmission
throughout. Together with the further improved
MCS+ circuit topology and the highly
acclaimed current feedback principle, this
makes for even better electrical characteristics.
In the output stage, high-power MOS-FET
devices renowned for their great sound and
utter reliability are arranged in a triple parallel
push-pull configuration per channel. MOS-
FETs have excellent frequency response and
high input impedance which reduces the load
on the preceding driver stage. They also have
perfect thermal stability. The power supply
features a massive toroidal transformer and
large filtering capacitors, sustaining the high-
quality power output rated at 260 watts x 2 into
4 ohms or 180 watts x 2 into 8 ohms.
MCS
＋
Multiple Circuit
（ ）
Summing
Q
1
+
INPUT
+
–
Q
3
NFB
NETWORK
NFB
NETWORK
NFB
NETWORK
Q
2
–
+
–
INPUT
Q
4
■
Power amplifier unit with power MOS FETs in triple parallel
configuration delivers ample power: 180 watts/channel into
8 ohms or 260 watts/channel into 4 ohms.
■
Instrumentation amplifier principle in power amplifier
section allows fully balanced signal paths. Current
feedback design ensures outstanding high-range phase
characteristics, together with further improved MCS+
topology.
■
Massive high-efficiency toroidal transformer and large filtering capacitors
(33,000 F x 2) provide ample reserves.
■
Output phase selectable individually for
each input, with visual indication. When INV
LED is lit, output phase is inverted. When
LED is out, phase is normal.
■
EXT PRE switch and power amplifier input
connectors allow independent use of power
amplifier section.
■
Two option board installation slots provide
further versatility. With AD-20 board, MC/MM switching on
E-460 front panel is possible.
■
Dedicated headphone amplifier optimized for sound quality.
■
Analog peak power meters for monitoring output levels.
■
Loudness compensator for enhanced bass at low listening
levels.
■
Tone controls using active filters for optimum sound quality.
■
Two sets of large-size speaker terminals accept also Y lugs.
■
Logic-controlled relays assure high sound quality and long-term
reliability.
■
Versatile array of inputs with two balanced inputs to shut out external
noise interference.
Line input and output connectors and balanced input connectors
Bias
stabilizer
Q
Q
Q
5
9
13
Q
17
Q
Q
Q
7
11
15
Bias
stabilizer
Bias
stabilizer
stabilizer
Q
Q
Q
6
10
14
Q
18
Q
Q
Q
8
12
16
Bias
stabilizer
Circuit diagram of E-460 power amplifier
"EXT PRE" selector
+
B
REGULATOR
1
+
Q
Q
Q
Q
19
21
23
25
OUTPUT
Bias
Q
Q
Q
Q
20
22
24
26
–
–
B
REGULATOR
1
(one channel)
"PHASE" selector
MC/MM selector
B
2
B
2
■ Power amplifier assembly and output stage with triple
parallel push-pull power MOS-FETs directly mounted to
large heat sink
Power MOS-FETs
Toroidal power transformer
Filtering capacitors
Large speaker terminals