The Clean Power Supply PS-1200 is a high-power version of the renowned PS-500. It can deliver up to 1200 VA which is more than ample to cover the requirements of most high-quality systems. The PS-1200 is based on waveform shaping, a revolutionary technique that drastically improves the purity of the AC power going into an audio system.

The AC power lines in homes as well as in office buildings, recording studios, and elsewhere are also connected to equipment containing digital circuits and microprocessors, such as computers and many kinds of electrical appliances. High-frequency noise components originating in such equipment can enter audio components via the power supply and severely affect sound quality by causing intermodulation noise and distortion. Only when such noise interference is removed and totally clean power is supplied, audio components become able to develop their full potential. Consequently, upgrading the quality of the AC power source of an audio system results in a sound quality improvement that must be heard to be believed.

The PS-1200 incorporates a revolutionary new technique which constantly monitors the input voltage waveform and adds or subtracts exactly the required amount of compensation to achieve a perfectly regular, sinusoidal waveform. This allows it to supply up to 1200 VA of extremely stable and clean energy to the components of an audio system. The use of a large "Super Ring" toroidal transformer and 20 output devices in a parallel push-pull arrangement ensure ample power control capability. Of course, the PS-1200 also has the ability to completely block any high-frequency noise components, resulting in total absence of modulation noise.

1. AC Voltage Stabilizer Based on Waveform Shaping Technology
The PS-1200 accepts AC power on the input side, processes it by comparing it to a precise reference waveform, and supplies it as clean AC power on the output side. Most of the AC energy from the input is carried over to the output. The loss introduced by the PS-1200 is very small, since it consists only of the power required for waveform compensation. Compared to conventional AC voltage stabilizers, efficiency is much higher and excess thermal energy is low, allowing the unit to be made relatively small and lightweight. Since the power supply frequency is synchronized to the input, an internal oscillator is not required. Therefore the unit itself does not generate any high-frequency noise.

2. Superior Waveform Compensating Power

3. Excellent Current Capability
The power amplifier which performs waveform compensation is configured as a pure complementary symmetrical circuit using current feedback for unsurpassed operation stability. The output stage uses 20 transistors rated for a maximum current of 16 amperes. These devices are connected in a parallel complementary push-pull arrangement which boasts a rated output current of 10A/5.2A and an instantaneous peak current (inrush current) rating of 120A/60A. This kind of current capability is an order of magnitude better than that of conventional power supplies.

4. Highly Effective Interference Rejection
The input side of the PS-1200 also contains a line filter for removing high-frequency noise components that may be present in the power line. The primary and secondary windings of the power transformer are kept totally separate, and the fully shielded design shuts out any externally induced noise.
Since the PS-1200 uses the AC feedback principle, output impedance is extremely low. This prevents any possibility of mutual interference between components connected to the outputs of the PS-1200.

5. Built-in Meter Allows Monitoring of Output Power, Input/Output Voltage, Input/Output Distortion
The meter of the PS-1200 lets the user see at a glance how much power the connected equipment is consuming at any given time. This is especially helpful for components such as integrated amplifiers or power amplifiers whose power consumption differs considerably depending on the volume setting and actual music signal. A meter selector also allows monitoring of input/output voltage or input/output distortion in real time.

6. Strong Power Supply With Large "Super Ring" Toroidal Transformer and High Filtering Capacity
The power transformer plays a vital role in any power supply. The PS-1200 uses a large toroidal type rated for 1500 VA. Toroidal power transformers have very low impedance and achieve high efficiency with compact dimensions. In particular, the "Super Ring" transformer used in the PS-1200 has the following advantages for audio applications: (1) Near-circular core caliber allows near-circular coil windings with high packing density, resulting in low weight, low losses, low leakage flux under actual load conditions, and minimum vibrations.
(2) Smaller ferrite core diameter and copper windings with high specific gravity mean low ferrite losses and low inrush current.

7. Elaborate Protection Features Assure Total Operation Safety
If any of the conditions described below should arise during operation, the circuit breaker integrated in the power switch immediately shuts off the power, to protect the unit and any connected components.

(1) Input current overload protection
The protection is activated when the combined power consumption of equipment connected to the AC outputs of the PS-1200 exceeds 1200 VA, causing the rated input current to surpass 10A/5.2A, or when an output connector is short-circuited.
(2) Instantaneous output current overload protection
For operation safety, a 120A/60A current limiter provides protection against momentary power overload such as caused by inrush current when a component is switched on.
(3) DC voltage in output
Output is cut off before any DC components can reach connected equipment.

8. Multiple Output Connectors
The PS-1200 can supply a number of components such as a CD player, DAT recorder, preamplifier, power amplifier etc., provided the combined power consumption is less than 1200 VA.

Since the value shown by the power meter of the PS-1200 in the "Wattage" position is the apparent power, the reading will be higher than the power consumption (W) given in catalogs and specification sheets.

* The rated power limit of the PS-1200 is 1200 VA. When deciding on equipment to be connected, power consumption figures given in catalogs and the like can be used for a general estimate, but actual power consumption should be checked using the meter.
* 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 that power consumption does not exceed 1200 VA also when peaks in the music are reproduced at high volume levels.

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