Q 2 Q 4
10 100 1k 10k 100k
Unbalanced input/output jacks and balanced input connectors
n Parallel push-pull power ampli ﬁ er unit achieves 115 watts
per channel into 4 ohms or 90 watts into 8 ohms.
The output stage devices feature excellent frequency response,
current ampli ﬁ cation linearity, and switching characteristics. These
high-power transistors have a rated collector dissipation of 100
n Instrumentation amplifier principle in power
ampli ﬁ er section
This allows the con ﬁ guration of fully balanced signal paths
from the input jacks to the output stage, including the
signal input stage. In addition, the current feedback design
ensures outstanding high-range phase characteristics.
n Large and highly ef ﬁ cient 400 VA transformer and
two 22,000 μF ﬁ ltering capacitors selected for
sound quality provide ample reserves.
n Option board installation slot provides further
versatility. With AD-20 board, MC/MM switching on
E-250 front panel is possible.
n EXT PRE switch and power ampli ﬁ er input connectors allow
independent use of power ampli ﬁ er section.
n Use of metal thin- ﬁ lm resistors in all signal paths ensures
superb low-noise performance.
n Large analog power meters show direct power output
n Logic-controlled relays for signal switching ensure high
sound quality and long-term reliability.
n Loudness compensator for enhanced bass at low listening
n “High Carbon” cast iron insulator feet further enhance sonic
n Versatile array of inputs with balanced connectors to shut out
external noise interference.
n Two sets of large-size speaker terminals designed for
The Accuphase E-200 series of basic integrated
ﬁ ers enjoys an excellent reputation both in
Japan and on the international stage. The E-250
represents a full model change of the E-213,
featuring the new AAVA-II volume control and
re ﬂ ecting the latest design technology advances
achieved by Accuphase. Carefully selected high-
quality materials and parts are used throughout,
in order to bring out even the ﬁ nest nuances of
the source. Using this integrated ampli ﬁ er af-
fords pure musical enjoyment.
In the category of integrated ampli ﬁ ers, AAVA
implemented in the E-550 and AAVA-II in the
E-450 and E-350 have received high praise for
being a clearly superior volume control princi-
ple. The E-250 inherits this advanced design
technology. In order to ﬁ t within the more limited
space available, circuitry and component layout
have been further re ﬁ ned and advanced integra-
tion technology is used to increase mounting
density. This was achieved while retaining the
outstanding performance that made AAVA and
previous AAVA-II implementations such impres-
sive feats of technology. AAVA-II in the E-250
of course also completely eliminates variable
resistors from the signal path. Ampli ﬁ cation and
volume control are integrated in a single entity
consisting only of top-quality and highly reliable
semiconductor parts. This eliminates mechani-
cal wear and associated problems, allowing the
control to function perfectly for many years.
The power ampli ﬁ er section is con ﬁ gured as
an advanced instrumentation ampli ﬁ er, which
enables fully balanced signal transmission
throughout. In conjunction with the current
feedback principle, this makes for even better
electrical characteristics. The output stage uses
high-power transistors designed for audio ap-
plications arranged in a parallel push-pull con-
ﬁ guration, greatly improving the capability of the
ampli ﬁ er to drive low impedance loads. Speaker
operation is sustained by a large power trans-
former with a maximum rating of 400 VA and
amply dimensioned ﬁ ltering capacitors, allowing
the ampli ﬁ er to deliver plenty of quality power:
2 × 115 watts into 4 ohms or 2 × 90 watts into
8 ohms. Power ampli ﬁ er inputs and an EXT PRE
function let you use the power ampli ﬁ er sepa-
rately in a stand-alone con ﬁ guration.
Integrated ampliﬁ er with innovative AAVA-II volume control – In the power am-
pliﬁ er stage, high-power transistors in a parallel push-pull arrangement are\
ported by a power supply with massive transformer and large ﬁ ltering capacitors.
Experience 90 watts per channel (into 8 ohms) of quality power before \
silent background. Instrumentation ampliﬁ er conﬁ guration allows balanced signal
transmission. Current feedback design ensures optimal high-range charact\
Large speaker terminals High-reliability parts selected for sound quality
Circuit diagram of E-250 power ampli
ﬁ er (one channel)
MC/MM Selector button
EXT PRE switch
Massive power transformer
LOUDNESS COMPENSATOR: ON
Frequency in Hz
Response in dB