● AC voltage stabilizer based on waveform shaping technology ● Acts as asource of extremely clean energy ● Low-distortion reference waveform generator● Highly effective waveform compensation ● Outstanding current capability● Superb interference rejection ● Built-in meter for monitoring vital parameters
including output power, input/output voltage, and input/output distortion● Advanced protection features ● Large high-efficiency toroidal transformer

The photograph shows the 230 V version.

Amazingly pure energy with momentary 80 A (160 A) current capability
Clean AC source with revolutionary waveform shaping technology delivers up
to 1200 VA (1000 VA)

Innovative Technology

Every audio component draws all of its energy from the power supply which in turn is connected to the AC power
grid. The Clean Power Supply components from Accuphase are products that remove noise and impurities fromthe AC power line through a groundbreaking new approach, resulting in a drastic improvement of the sound andpicture quality of connected audio and video equipment. Without relying on an oscillator, the reference waveformis created with further improved accuracy and is linked to the power section by a balanced connection to ensure
incredibly low distortion in the output waveform. Because the PS-1230 can deliver as much as 1200 VA (1000 VA),
it covers the requirements of almost any high-quality A/V system currently on the market.

Low-distortion reference waveform generator
To generate the 230 V (120 V) sine wave reference signal, the zero-cross point at thesecondary winding of a measurement circuit transformer is detected by a comparator and usedby the high-precision power supply to generate a square waveform. The square wave then isrouted through a newly developed 50/60 Hz band pass filter and a six-stage band elimination
filter (BEF). The filter frequency is switched in sync with the input frequency, for automatic
50 Hz and 60 Hz support. By routing the signal through another band pass filter, alow-distortion sine wave (reference signal) is created that is not dependent on the input voltage.
Operation Block Diagram of PS-1230

Outstanding waveform compensation power
Figure (a) shows a severely distorted waveform such as commonlyencountered in ordinary AC outlets at home. Simple filtering will never beable to bring this waveform back to the intended shape. Figure (b) shows
the condition where noise is affecting the AC power. Filtering will be able
to remove some of the higher frequency noise components but low
frequency components are very difficult to remove.
The PS-1230 incorporates power waveform shaping technology that uses
a clean reference waveform and works in real time to provide exactly therequired compensation and remove any unwanted components. Distortionis reliably eliminated and the result is a perfectly clean source of energy.
Waveform shaping principle of PS-1230

Distortedwaveform
0Waveform
affected by noiset0t0Compensation waveform
0Compensation waveform

PS-1230 output
waveform(a) Compensation is provided
for distorted parts of waveform

Reference waveform assemblytPS-1230 output
waveformt0tt0(b) Influence of noise is calculated andwaveform compensation is applied
accordingly＊ The figures in brackets apply
to the 120 V version.

The photograph shows the230 V version.

Clean and Powerful Energy Supply
Power supply waveform and clean PS-1230
output waveform
Almost all electrical devices used in a household
convert the AC supplied bythe outlet into a DC current
forpoweringinternalcircuits. This task is
performed by a rectifier. As
shown in photograph ⓐ,
the rectifier load current
has a pulse waveform witha large current flowing
momentarily in the vicinityof the voltage peak.
This causes a voltage
drop, resulting in clipping of
the voltage waveform, as
shown in photograph ⓑ. A
clipped waveform with ahigh amount of distortion
contains many unwanted
frequency components, or
harmonics, as shown in theleft-side graph below.
When entering the audio
circuitry of an amplifier
through the power supply,
such harmonic components can interfere with theaudio signal and causeintermodulation distortion
which greatly affects soundquality.

Photo ⓐ Current waveformof rectified load

Photo ⓑ Voltage waveform ofAC line (distortion approx. 3%)

Photo ⓒ PS-1230 output waveform(distortion approx. 0.06%)

When passing through the PS-1230, harmonics within theaudible range are largely removed (frequency spectrum inthe right-side graph below), and the result is a clean sine
waveform as shown in photograph ⓒ.
[dB]0.0[dB]0.0—20.0—20.050Hz

—40.0

—40.0

—60.0

—60.0

—80.0

—80.0

—100.0—100.0—120.00

10k20k[Hz]

Frequency spectrum of power line (photo ⓑ)—120.0Exceptional current capability

The power amplifier which performs
the waveform adding/subtraction
action is designed for ample waveform compensation performanceand complete operation stability.
The final stage employs bipolar
power transistors rated for a maximum current of 15 amperes. These
devices are connected in a 20-parallel complementary push-pull arrangement which boasts a rated
output current of 5.2 A (8.3 A) andan instantaneous peak current (inrush current) rating of 80 A (160 A).
This demonstrates the excellent
current capability of the PS-1230.

50Hz

010k20k[Hz]Frequency spectrum of PS-1230 output (photo ⓒ)Frequency spectrum of power line

Dedicated left and right heat sinks ensure ideal
thermal dissipation

The power amplifier section (with heat sinks) is separated
into two parts positioned on the left and right side of thechassis, for maximum thermal dissipation efficiency.

Advanced Features

Three-step interference rejection

The input side of the PS-1230 is equipped with a line filter
for removing any high-frequency noise components
present in the power line, such as generated for example
by digital equipment. The primary and secondary windingsof the power transformer are kept totally separate, and thefully shielded design shuts out any externally induced noise.
Since the amplifier uses the feedback principle, output
impedance is extremely low. This prevents any possibilityof mutual interference between components connected tothe outputs of the PS-1230. The graph above shows thefrequency spectrum of the power line and of the PS-1230
output. It can be clearly seen that harmonic components inthe audible frequency range are almost completely
removed when power passes through the PS-1230.
Line filter

Shielded isolationtransformer

Depending on the setting selectedwith the function buttons, thefollowing information is shown.

DISTORTION scale (%)■ or ■
Used for 4
5VOLT-AMPERE scale (VA)
Used for ■1
VOLTAGE scale (V)Used for ■2 or ■
3
Assembly with input voltage/
distortion monitoring circuitry

Meter of 230 V AC version

High-speed
adding/subtracting
circuit

Built-in meter allows easy monitoring ofoutput power (VA), input/output voltage (V),and input/output distortion (%)
Overload indicated by flashing LEDs

The power consumption of audio components such as
integrated amplifiers or power amplifiers differs
considerably depending on the volume. Being able tocheck while actually playing music is therefore highly useful.
The meter of the PS-1230 lets the user see at a glance
how much power the connected equipment is consuming at
any given time. If the maximum rated output power of 1200
VA (1000 VA) is exceeded, the meter function selector
LEDs flash as a warning indication.

Reliable protection functions■ Meter

If any kind of problem should occur during operation, thecircuit protector immediately is triggered to protect the unit
and any connected components from possible damage.

1
■

2
■

3
■

4■

5
■

■ Meter operation OFF button

Turns meter operation and meter
illumination on or off.

■ Meter function selection
pushbuttons■
1 Combined power consumption (VA)■
2 AC input voltage (V)■3 AC output voltage (V)■4 AC input distortion (%)■5 AC output distortion (%)■
6 Auto-monitor

Assembly with protection circuitry

6■Advanced Features
Strong power supply with high-efficiency toroidal transformer and large
filtering capacitors (47,000 µF x 2)

PS-1230 Meter (Power)
Indication and Load
The power consumption of electrical equipment, as indicated on the equipment itself andin catalogs and other documentation according
to legal requirements, is usually given inwatts (W). This figure represents the so-called
effective power. However, the actual powerdrawn by the equipment is larger than theeffective power. This is called the apparent
power which is calculated by multiplying theapplied voltage (230 V or 120 V) with theactual current. The unit for apparent power is
VA (Volt-Ampere).
Since the value shown by the meter of thePS-1230 is the apparent power, the reading
will be higher than the power consumption (W)given in catalogs and specification sheets.

The PS-1230 uses a massive toroidal
type power transformer with high output
capability. Rectification and smoothing is
performed by two large aluminum electrolytic capacitors rated for 47,000 µF
and built for high sound quality applications. This provides more than ample
leeway.
AC voltage stabilizer based on
waveform shaping technology
The control circuitry of the PS-1230 isoperating with alternating current. Most of
the AC energy from the input is therefore
carried over to the output. The introduced
loss consists only of the power required
for waveform compensation, resulting inhigh efficiency and eliminating the needfor an internal oscillator. This also meansthat no high frequency noise is emitted
by the unit.

THD

Efficiency[%]

80604020Output power/efficiency (input power)
characteristics

Output power/THD characteristics● In case of overload, the meter function selector
LEDs flash. Reduce the load by reducing thenumber of connected components until the LEDs
stop flashing and stay constantly lit.

Total of Eight AC Outlets

Elegant side panels made of extruded aluminum
The massive side panels are made ofextruded aluminum and finished to a highgloss, perfectly complementing thechampagne-colored front panel andcreating an exquisite look.

230 VFront Panel (The photograph shows the 230 V version.)

Power switch/circuit
protector● The power consumption of integrated amplifiers
and power amplifiers varies considerably depending on the actual audio output. After connecting
such equipment, perform playback and verify thatpower consumption does not exceed the maximum rating when peaks in the music are reproduced at high volume levels.

120 V

Meter
Output power, input/output voltage,input/output distortion● The rated power limit of the PS-1230 is 1200 VA
for the 230 V AC version and 1000 VA for the 120
V AC version. When deciding on equipment to beconnected, select components so that the totalremains within these limits, and check actual
power consumption using the meter.

Rear Panel (The photograph shows the 230 V version.)AC outlets
8 outlets on rear panel

Meter of 120 Vversion

Meter operation Meter function selector buttons
OFF button
VOLT-AMPERE (VA) VOLTAGE INPUT/OUTPUT (V)DISTORTION INPUT/OUTPUT (%) AUTO-MONITOR

AC outlets of 120 V version

AC power connector ★
The usable power supply
voltage is indicated here.

GUARANTEED SPECIFICATIONS
Rated output capacity

120 V version
1,000 VA (continuous)230 V version
1,200 VA (continuous)

Rated output voltage

120 V AC ±1.5 V

230 V AC ±3.0 V

Rated output current

8.3 A

5.2 A

Output frequency
Instantaneous peak current capacity

50 Hz or 60 Hz (identical to input frequency)
160 A

Output waveform THD
Input voltage range

0.08% or less
120 V AC ±10%

Input frequency
No-load power consumption
Cooling principle

80 A
230 V AC ±10%50 Hz or 60 Hz
39 W

50 W
Natural air cooling

Meter
VOLT-AMPERE
VOLTAGE INPUT/OUTPUT(green zone of scale)
DISTORTION INPUT/OUTPUT
AUTO-MONITOR
Maximum Dimensions
Mass

120 V version

230 V version
0-1200 VA

when overload occurs
120 V AC ±5%230 V AC ±5%

0-6%
Display cycles automatically from VOLT-AMPERE toDISTORTION OUTPUT, showing each mode for 5 seconds
Width
465 mm (18-5/16")
Height243.4 mm (9-9/16")
Depth
500.2 mm (19-11/16")
41.7 kg (92.0 lbs.) net
51.0 kg (112.4 lbs.) in shipping carton

Note★ The 230 V AC and 120 V AC versions of the PS-1230 differ regarding meter voltage indication, AC output connector shape, supplied power cord, etc. Make sure that you have the correct version.

Caution＊The PS-1230 is available in 230 V AC and 120 V AC versions. The actual allowable voltage is indicated next to the AC power connectors on the rear panel. Be sure to check thisindication before using the PS-1230.
＊This product can be used only on a regular household AC circuit rated for 230 V or 120 V AC, 50/60 Hz. Using the product with portable AC generators, airplane or ship power
generators or other types of power sources is not possible.
＊This product is designed to improve the quality of AC power supplied to audio or video components. Do not use it to power industrial type equipment or common household electricalappliances.
＊Do not use this unit for powering equipment where failure incurs a risk of injury or fatal accidents (medical equipment, aviation equipment, traffic control equipment, furnace and heating
control equipment, safety devices, etc.). Accuphase will not be liable for any problem occurring due to use of the PS-1230 with the above type of equipment.

Supplied accessory● AC power cord

●The specifications and appearance of this product are subject to change without notice.
J1610Y PRINTED IN JAPAN 850-2198-00 (B1)