Clean Power SupplyPS-1250

Accuphase Laboratory, Inc.

Accuphase Clean Power Supply series is an epochmaking audio product that enables all users to improvetheir power supply quality by forming an ideal power
supply waveform with precise analog signal processing.
It shows a terrific performance to obtain great sound andimage quality.
After launching PS-1200 in 1997, Accuphase has been
making improvements one after another, as known as
PS-1200V, PS-1210, PS-1220, and PS-1230.
Accuphase makes PS-1250 known to the public, the 6thgeneration Clean Power Supply succeeding PS-1230.
The main features of PS-1250 are…
- Color liquid crystal display- Precise reference signal generator- Low power consumption- Low Total Harmonic Distortion1

Exterior• Color liquid crystal display• Waveform display switch
display switch
Meter offWaveform
switchLED illumination
Color liquid crystal display
Aluminum side panel
PS-1230

PS-1250

Accuphase Laboratory, Inc.

PS-1250 newly adopts the color liquid crystal panel,
It clearly displays the input/output power waveform.
By switching the display switch, you can also confirm thetotal power consumption, the input/output voltage, or theinput/output distortion ratio.

2Internal View
High-efficiency large troidal transformer
Isometric output wiring

Power amplifier block

Power amplifier block

48,000μF Capacitor x 2

Accuphase Laboratory, Inc.

PS-1250 has a symmetric internal structure same as
Accuphase stereo power amplifiers.
A massive power supply section sits at the unit's center,and power amp blocks are on both sides.
These two power amp blocks are balanced connections
which low output impedance.
All the internal output wires are isometric and set at thesame length. It helps the electric performance and soundquality of each AC outlet keep the same level.

3Power amplifier blocks• Output stage with 20-paralleled bi-polar transistors• Balanced connection for internal signal path

Accuphase Laboratory, Inc.

Power amp blocks consist of 2 circuits of 10-paralleledbi-polar transistors output stages and are fully parallel
driving.
It leads to the success of high peak output current andlow output impedance.
The inputs to each power amp section are balanced
connections.

4Reference signal generator• Guaranteed Total Harmonic Distortion– PS-1250: 0.08%

BPF
AC LineBEF x3BPF
ReferenceSignalLimiter

PS-1250
BPF: Band Pass Filter, BEF: Band Eliminate Filter

Accuphase Laboratory, Inc.

Reference Signal Generator is the circuit that eliminates
the noise and distortion components in AC line signals
with filters and generates the reference signals forwaveform shaping.
PS-1250 has evolved this Reference Signal Generator
much more precisely.
PS-1250's configuration is that two stages of theBandpass Filters remove undesired out-of-band signals.
Then, the three stages of the Band Eliminate Filters also
remove the harmonic component.
These two features contribute to the low distortion effects
on the reference signals.

5

Waveform display function• Waveform display function with color liquid crystal display

Input waveform

Output waveform

Accuphase Laboratory, Inc.

The color liquid crystal display shows the input/output
waveform.
The waveform display function enables you to compare
the input waveform from the wall socket with the output
waveform compensated by the PS-1250.
The power source waveform from the wall socket inordinary houses is a deformed sinewave due to distortion.

6