m Triple parallel push-pull output stage with power MOS-FETs
driven in pure class A delivers quality power: 30 watts per channel
into 8 ohms m Current feedback principle ensures superb
phase characteristics in high frequency range m Logic-controlled
relays for shortest signal paths m Tone controls m Large
toroidal power tr ansfo r mer provides ample reser ves

The ultimate integrated amplifier operating in pure class A. Triple parallel
output stage with power MOS-FET devices and strong power supply withtoroidal transformer provide linear power progression: 120 W/ch (2 ohms),
60 W/ch (4 ohms), 30 W/ch (8 ohms). Current feedback topology inpreamplifier and power amplifier sections assures superb sound.

To assure low impedance and constant voltage
speaker drive, the power amp section of theE-530 employs power MOS-FET devices
arranged in a triple parallel configuration andoperating in pure class A. The power supply
features a large toroidal transformer andmassive, high-quality filtering capacitors,
supporting an output rating of 120 watts into
2 ohms, 60 watts into 4 ohms, or 30 watts into
8 ohms. This linear progression of power
versus load impedance demonstrates theimpressive capabilities of the E-530. Both thepreamplifier section and power amplifier
section use the highly renowned current
feedback topology developed by Accuphase.
The two sections can each be used in standalone mode. The E-530 is on a par with topnotch separate type amplifiers, both in termsof performance and sound quality.
To prevent any possibility of interference, thepreamplifier is driven by its own dedicatedpower supply. Features such as tone controls
and loudness compensation allow tailoring ofthe sound. Playback/record connections fortwo recorders as well as terminals for two setsof loudspeakers make the E-530 the ideal
centerpiece of a quality audio system. An
optional digital input board allows direct
handling of the digital signal from a CD playeror other digital component, for highest-grade

reproduction. Playback of analog records isalso possible with an optional analog disc input
board.
Triple parallel push-pull output stage withpower MOS-FETs operating in pure class
A. Linear power rating of 120 watts/2 ohms,60 watts/4 ohms, or 30 watts/8 ohms.
The output stage (Figure 1) uses power MOSFETs which have negative thermal
characteristics. These are connected in a triple
parallel configuration and driven in pure classA, ensuring linear power output down to
extremely low load impedances. The parallel
connection keeps output impedance low andminimizes inherent noise, and it also serves
to distribute heat generated by the devices.
This design
m a k e s
efficient useof the superb
linearity ofMOS-FET
devices in thelow power
range, contributingtoperformanceand sound
Output voltage (V)1-ome operation possible
quality. Figure* withmusic signals only
2 shows the Fig. 2 Output power vs. load impedance(output voltage/output current: actual measurements)
output power/
current characteristics for various loadimpedances. Output voltage remains largely
Output current (A)The E-530 is the ultimate integrated amplifier.
It represents the sophisticated knowledge
gained by Accuphase over many years ofdesigning superb components. Latest circuit
topology is matched by top-quality parts. The
Accuphase dedication to sound quality is inevidence everywhere. In the output stage,
power MOS-FETs driven in pure class A
provide a musical experience second to none.
The sound is detailed, expressive, andexemplary. The E-530 is destined to becomea new reference for an advanced generationof integrated amplifiers.

Power MOS-FETs

NFB
NetworkCurrent feedback topology in power
amplifier and preamplifier sections
guarantees top-level performance
In the E-530, the signal current rather thanthe voltage is used for feedback. Figure 3
shows the operating principle of this circuit.
Current adder
Input
Buffer

I-V
converter
Trans-impedance
amplifierAmplifierOutputCurrent NFB
networkFig. 3 Current feedback amplifier principle

Since the impedance at the current feedback
point (current adder in Figure 3) is very low,
there is almost no phase shift. Phase
compensation can be kept to a minimum,
resulting in
excellent
transient
response andsuperb sonictransparency.
Figure4s h o w s Fig. 4 Frequency response with current feedbackf r e q u e n c y (Response remains uniform even when gain changes)
response for different gain settings of thecurrent feedback amplifier. The graphsdemonstrate that response remains uniform
over a wide range.
Discrete-type line amplifier for superior
sonic purity
The line amplifier (Figure 5), which handles
high-level signals from a CD player, tuner, or
similar component, is entirely built fromdiscrete par ts. The circuit uses current
feedback in a topology that results in a purecomplementary push-pull configuration. The

Regulator

Input

constant even when load impedance changes,
which means that the current increases
linearly. The amplifier has ample reserves tohandle musical signals with transient pulses,
which is demonstrated by the clipping power
rating from actual measurements: 180 watts
into 1 ohm (music signals only), 153 watts into
2 ohms, 103 watts into 4 ohms, or 62 watts
into 8 ohms.

OutputBias stabilizing
circuit

Input

OutputRegulator

Fig. 1 Power amplifier circuit diagram (one channel)

Fig. 5 Line amplifier circuit diagram

n Power amplifierassembly withtriple parallel
power MOSFETs and current
feedback circuitry
mounted to large heat sinkn Supplied remote commander RC-29
Allows volume adjustment andsource switching.

InputOutput

minimum contact resistance andoutstanding long-term reliability.
Fig. 6 Tone control circuit diagram(summing active filter type)parallel arrangement of input devices helps tominimize noise.

Large toroidal power transformer and highfiltering capacity

Gold-plated input/output jacks
connected directly to relays

Line amplifier assemblyHighly reliable logic-controlled relays
Program source switching is performed bylogic-controlled relays which are arranged so
as to permit the shortest possible signal paths.
The hermetically sealed relays are high-quality
types developed specifically for demanding
communication applications. The contacts are
twin crossbar types plated with gold forTone controls use summing active filters
for pure soundThe tone control circuitry in the E-530 was
specially designed with summing active filters.
Figure 6 illustrates the operation principle ofthis circuit. The flat signal is passed straight
through, and only when an adjustment isrequired, the characteristics created at F1 andF2 are added to the signal, thereby producing
the desired change. This design provides
efficient control without degrading signal purity.

The power supply section features a massive
toroidal power transformer with a rating of 450
VA. The high-efficiency transformer is housed
in a non-resonant aluminum enclosure. Twolarge electrolytic capacitors, each rated for
40,000 µF, assure ample reserves also for
reproduction of the most demandingpassages.

Option Boards

Other Features and Functions

Digital Input Board

Three types of option boards are available for the E-530:
Digital Input Board DAC-10, Analog Disc Input Board AD10, and Line Input Board LINE-10. Insert the desired board
in one of the rear-panel option board slots.

n Option board slots allow easy function
expansionn Two speaker outputs
n Analog peak power meters

This board features an MDS (Multiple Delta Sigma)
D/A converter and has inputs for coaxial and opticalfiber connections.

m It is also possible to use two identical boards in both slots.

n High-quality volume control. Supplied remotecommander for volume adjustment and source
switchingn High carbon cast-iron insulator feet

It can accept the digital output signal from components suchas a CD player, MD recorder, DAT recorder, etc. (sampling frequency range 32 - 96 kHz, 24 bits).

m The Analog Disc Input Board AD-9 and the Line Input Board
LINE-9 can also be used.
m The DAC-10 cannot be used in the models E-407, E-406V,
E-306V, E-211, and C-265.

n Dedicated headphone amplifier designed forhigh sound quality
n EXT PRE button and preamplifier output - Poweramplifier input jacks allow separate use of both
sections
n Loudness compensator for enhanced bass at
low listening levels

DAC-10Analog Disc Input Board

AD-10

This board contains a high-performance, high-gain
phono equalizer.
m Internal DIP switches control MM/MC operation, MC input

impedance, and subsonic filter on/off.

MMMC

Gain
: 36 dB
Input impedance : 47 kilohms
Gain: 62 dB
Input impedance : 10/30/100 ohms
(selectable)

Line Input Board

LINE-10

This option board provides an additional set of conventional
unbalanced line inputs which can be used to connect a CD
player, tuner, or other component with analog output.

Compensator response

Option board shown in photo is DAC-10

n Front panelGUARANTEED SPECIFICATIONS[Guaranteed specifications are measured according to EIA standard RS-490.]m Continuous Average Output Power (both channels driven, 20 - 20,000 Hz)
150 watts per channel into 1 ohm (*)
120 watts per channel into 2 ohms
160 watts per channel into 4 ohms
140 watts per channel into 6 ohms
130 watts per channel into 8 ohms
Note: 1-ohm ratings marked (*) are for music signals only.
m Total Harmonic Distortion (both channels driven, 20 - 20,000 Hz)
0.05%, with 2-ohm load
0.02%, with 4 to 16-ohm loadn Rear panel

Push to open
sub panel

0.01%
HIGH LEVEL INPUT / MAIN INPUT
0–0.2 dB (At continuous average rated output)
0–3.0 dB (At 1 watt output)m Damping Factor

120 (with 8-ohm load, 50 Hz)

m Input Sensitivity, Input ImpedanceSensitivity
For rated output
For 1 W output (EIA)
61.7 mV
11.3 mV
HIGH LEVEL INPUTBALANCED INPUT
61.7 mV
11.3 mV
MAIN INPUT
0.617 V113 mV

Option board
expansion
slots

Input

★
A INPUT SELECTOR
LINE2 LINE1 LINE-BAL CD-BAL
CD TUNEROPTION1
OPTION2
B Power Meters(Decibel Output indication (dB/%))C Function LED indicators
D VOLUME Control
E POWER Switch
F SPEAKER Selector OFF A B A+B
G COPY Selector
1→2 OFF 2→1
H RECORDER Selector
REC OFF SOUCE
12I EXT PRE (Preamplifier/Power AmplifierSeparator) ON/OFF Buttom
J METER Display On/Off Button

K STEREO/MONO Button
L COMP (Compensator) ON/OFF Button
M TONE Controls ON/OFF Button
N BASS Control
O TREBLE Control
P BALANCE Control
Q Attenuator Switch
R PHONES JackS Line inputs
T Recorder Input/Output Jacks21 SPEAKERS Terminals (A, B)
U
22 CD/LINE INPUTS (BALANCED)UU
23 PRE OUT Preamplifier Output Jacks
24 MAIN IN Power Amplifier Input Jacks
U25 AC Power Supply Connector ★
URemarks★ This product is available in versions for 120/230 V AC. Make sure that the voltage shown on
the rear panel matches the AC line voltage in your area.
★ The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating
and destination country.

n Supplied accessories:m Intermodulation Distortionm Frequency Response
20 to 20,000 Hz
2 to 150,000 HzInput impedance
20 kΩ
40 kΩ
20 kΩ

m Output Load Impedance

PRE OUTPUT: 0.617 V
50 ohms(At continuous average rated output)

m GainHIGH LEVEL INPUT →MAIN IN→

m Tone Controls

Turnover frequency and adjustment range
BASS:
300 Hz±10 dB (50 Hz)
TREBLE:
3 kHz±10 dB (20 kHz)PRE OUTPUT:OUTPUT:

20 dB
28 dB

m Loudness Compensation+6 dB (100 Hz) (Volume control setting –30 dB)

m Attenuator–20 dBm Signal-to-Noise Ratio
Input
HIGH LEVEL INPUTBALANCED INPUT
MAIN INPUT
m Power Level MetersInput shorted, IHF-A weighting
S/N ratio at rated input
106 dB
92 dB
92 dB

S/N ratio (EIA)
80 dB
80 dB
80 dB

Logarithmic compression, peak reading meters witha dB scale, Output indication (dB / %)m Load Impedance

2 - 16 ohms

m Stereo Headphones

Suitable impedance:m Power Requirements

120 V/230 V (Voltage as indicated on rear panel) AC, 50/60 Hz

m Power Consumption

180 watts idle
280 watts in accordance with IEC-65

m Maximum Dimensions

WidthHeightDepthm Weight25.0 kg (55.1 lbs) net
30.0 kg (66.1 lbs) in shipping carton

8 - 100 ohms

475 mm (18-11/16")
196 mm (5-7/8")
422 mm (16-5/8")• AC power cord
• Remote commander RC-29• Specifications and design subject to change without notice for improvements.

http://www.accuphase.com/

K015Y

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