CLEAN POWER SUPPLY● Input /output waveform display ● Output power meter ● Input /output
voltage meter ● Input /output distor tion meter ● Massive output capacity● 0.08% total harmonic distortion waveform shaping ● High-grade output
voltage correction ● Numerous output terminals ● High-sensitivity protection
circuitry ● Large high-efficiency toroidal transformer ● Large filtering capacitors

A clean power source with revolutionary waveform shaping technology
The power supply delivers the energy your audio equipment uses for music playback. Accuphase’s Clean Power Supply
components provide a power source with minimum noise and distortion by utilizing a groundbreaking waveform shaping
technology that compares the power supply’s waveform to a reference waveform, then supplements insufficiencies andremoves any excess misshaping. The results of waveform shaping are then observable in a new waveform display.
The PS-1250 delivers impressive improvements in audio quality, making it an essential supplement to fine audio equipment.

Groundbreaking technology■ The waveform shaping process■ Clean output waveforms
Figure 1 shows the waveform for power and its harmonics supplied in a typical home. These
typical power supply waveforms are distorted and contain unwanted harmonics. When theseharmonics find their way into the audio equipment, they interfere with the audio signals anddegrade the sound quality. Figure 2 shows the output waveform from the PS-1250 and its
harmonics. Third-order harmonics have been reduced from –40 dB to –80 dB. This is how thePS-1250 significantly reduces harmonics in the output sine waves and minimize distortion.

Input waveform

Input waveformt0Compensation waveform

Compensation waveformt0

Output waveform

Power supply waveform
0〔dB〕

-30

Output waveform

t0t-30Third-order harmonics : –40 dB-60-60-90

Third-orderharmonics reduced
by 40 dB

-120-15000t0

Output waveform

〔dB〕

t

00

2k

4k

6k

8k

10k〔Hz〕

Third-order harmonics : –80 dB

-90

-150

0

2k

4k

6k

8k

Waveform spectrogram

Waveform spectrogram

Fig. 1: Power supply in a typical home

Fig. 2: PS-1250 output■ Three stages of noise elimination

Line filter

Shielded toroidal
power transformer

Display

Waveformcorrection amp

Before wave shaping

OutputShaping the ideal waveform requires a highly accurate reference
waveform. The PS-1250 detects the zero-cross point in the power supply
to generate a square waveform, which is then sent through a two-stage
band pass filter and a six-stage
band elimination filter togenerate a highly precise
reference waveform free fromharmonics.
Shielded toroidal
power transformer

Display switching circuitry;
measurement circuitry
Output waveform

TemperaturesensingDC-ACdetection
Current
detection

Shielded toroidal
power transformer

Circuitprotector

The PS-1250 creates an ideal waveform sine wave before a signal isreceived (reference waveform). It then produces a sine wave of the input
waveform by comparing it to this reference waveform and compensating
any insufficiencies while also removing any excess impurities.

Display OFF and display selectors

Measurement
circuitry transformer

Filtered waveform

10k〔Hz〕■ Reference waveform generator

The PS-1250 features three stages of noise elimination. In the first stage, a line
filter removes noise components from digital devices and other similar equipment.
The second stage involves a shielded toroidal power transformer, which eliminates
common mode noise. The third stage consists of a waveform correction amp,
which uses waveform shaping to generate an extremely clean power supply.
Input(a) Shaping distorted waveforms (b) Shaping waveforms containing noise-120

RectifierNoiseprevention circuit

Line filter

Inrushprevention circuitProtectioncircuitry~ AC IN

Large filter
capacitors
Reference-signalgenerator circuit

Input waveform

Balancedtransmission

Reference waveform

Block Diagram

Comparison ofinput and reference
waveforms

Waveform
Difference fromcorrection amp reference waveform
Waveform control circuitry

The figure shows the 230 V version.

Waveformcorrection amp

Filtering capacitors

Waveformcorrection amp

The photograph shows the 230 V version.

Advanced features■ Output power meter・・・・・・・・・・・・・・・・・・・・・・・・・・・・・①■ Input/output voltage meter ・・・・・・・・・・・・・・・・・・②■ Input/output distortion meter ・・・・・・・・・・・・・・・③■ Input/output waveform display ・・・・・・・・・・・・・④■ Massive output capacity■ 0.08% total harmonic distortion waveform
shaping■ Output voltage correction■ Multiple output terminals■ High-sensitivity protection circuitry■ Large high-efficiency shielded toroidal
power transformer■ Large filtering capacitors

Display
OFF switch

Selects the display mode❶❷❸❹■ Waveform shaping to achieve highefficiency and low noise

Waveforms are shaped as pure AC with no conversion
to DC, which helps improve efficiency. And because
the PS-1250 does not rely on oscillators, the risk ofgenerating high-frequency noise has been eliminated.

❶ Output power (VA)

❷ Input/output voltage (V)80

Efficiency (%)

60

40

Output waveform

Input waveform❹20❸ Input/output distortion (%)
The display can show the following
attributes.
❶ Output power (VA)
❷ Input/output voltage (V)❸ Input/output distortion (%)❹ Input/output waveform
The input/output waveform display
shows the input power supply andoutput power supply waveforms.
＊ The photograph shows the 230 V version.

0200

400

600

800

Output power (VA)

1000
1200
Load: Purely resistive

Output power/efficiency characteristics

Total harmonic distortion (%)

0.8

0.6

0.4

Protection circuitry protects the unit and all connected
equipment if abnormalities should occur.

0.2

0200

400

600

800

Output power (VA)

1000
1200
Load: Purely resistive

Output power – THD characteristics

20-parallel push-pull output stage

The photograph shows
the 230 V version.

Advanced Features■ Robust power supply stage■ Elegant appearance

The PS-1250 features a strong
power supply consisting ofa large shielded toroidal powertransformer and two large filtering
capacitors (48,000 μF/100 V).

The aluminum side panels are
finished to a high gloss andperfectly complement thechampagne-colored front panel
to create an exquisite look thatwill blend in seamlessly withany audio system.

Shielded toroidal
power transformer

Filtering capacitors

Compatible equipment■ Multiple output terminals
The PS-1250 is equipped with multiple output terminals toaccommodate numerous audio equipment components.
Rear Panel ▼

120 V

230 V

Though power consumption for electrical equipment is shown in watts (W), theVA (volt-ampere) of the system components is used to determine which units
can be connected with the PS-1250. The VA/W ratio is different for each pieceof electrical equipment, but the VA value is generally 1.2–1.8 times the W value.
How to check● Switch the display mode to the VOLT-AMPERE display and connect the equipment, making
sure the total is less than 900 VA.
● The LED on the display selector will blink if the total exceeds 1,200 VA. Disconnect anyequipment until the light turns steady.
● Since the VA level of integrated amplifiers and power amplifiers depends on the volume level,
keep VA below 900 VA at maximum volume levels.

Front PanelDisplay

Power switch

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

Output power (VA)
Input/output voltage (V)Input/output distortion (%)
Input/output waveform

AC outlets of 120 V version

Eight ACoutput terminals

The usable power supply
voltage is indicated here.

Display
Display
OFF switch selector buttons

AC power supply connector ★

Guaranteed Specifications
Rated Output Capacity
Rated Output Voltage
Rated Output Current
Output Frequency
Output Waveform THD
Rated Input Voltage
Input Frequency
No-load Power Consumption
Cooling Principle

900 VA (continuous)
AC 120 V ±1.5 V
AC 230 V ±3.0 V
7.5 A
3.9 A
50 Hz or 60 Hz (identical to input frequency)
0.08% or lessAC 120 V ±10%
AC 230 V ±10%50 Hz or 60 Hz
37 W
55 W
Natural air cooling

VOLT-AMPERE
Display

VOLTAGE INPUT / OUTPUT(green zone range)

0–1,200 VA
AC 120 V ±10%

DISTORTION INPUT / OUTPUT

0~6%

WAVE FORM INPUT / OUTPUT
Maximum Dimensions
Mass

AC 230 V ±10%íWidth 465 mm (18.3") × Height 243 mm (9.6") × Depth 499 mm (19.6")

Net

42.1 kg (92.8 lbs.)

41.3 kg (91.1 lbs.)

In shipping carton

51 kg (113 lbs.)

51 kg (113 lbs.)

Note★ The 230 V AC and 120 V AC versions of the PS-1250 differ regarding meter voltage indication, AC output connector shape, supplied power cord, etc. Make sure that you have the correct version..

Caution＊The PS-1250 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-1250.
＊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 electrical appliances.
＊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-1250 with the above type of equipment.

Supplied accessory● AC power cord

●The specifications and appearance of this product are subject to change without notice.

https://www.accuphase.com/

A2303Y

850-2230-00（B1） PRINTED IN JAPAN