PS Audio C250 ユーザーズマニュアル

Based on the classic lines of the P600 

Power Plant, this is built in true ‘battleship’ 

fashion.  This 95 pound audio sculpture is 

simply magnificent in its build quality and 

attention to detail.

The side heat sinks are on hinges and fold 

down to expose the C250’s circuitry for 

easier access to the internal circuitry.

No expense has been spared on the most 

visible evidence of the Classic approach 

to power amplification.  The look exudes 

finesse.

 

The front panel is a nearly two inch thick 

combination of extruded aluminum panels 

tied together both top and bottom with one 

inch slabs of hand finished aluminum.  The 

entire assembly is then melded together to 

form the luscious curves you see.

 

Parts quality is second to none.  Low ESR 

capacitors, each with film and foil bypass 

capacitors, 1% resistors throughout, 40 

hand selected high current bipolar output 

devices, two custom wound and individu-

ally serialized 800VA toroidal transform-

ers, and the front panel meter is a custom 

manufactured replica of the classic Simp-

son volt meters of years ago.  Nothing has 

been spared in the Classic 250.

The design idea behind the Classic 250 is 

based on the marriage of four discrete and 

independent systems.  The fact that each 

of these systems is completely indepen-

dent both physically and electrically from 

the other is one of the keys to the Classic 

250’s sonic success.  

The four sections are: 

 

• The input gain stage 

 

• The internal Power Plant 

 

• The output X1 stage

 

• The main power supply

This critical element is, in large part, re-

sponsible for the way the amplifier sounds.  

By carefully tuning the audio parameters 

of the input gain stage we can tweak and 

play with the amplifier until it sounds abso-

lutely musical.

In the Classic 250, the input gain stage 

consists of two gain blocks: a zero feed-

back JFET input stage and a zero feed-

back bipolar stage.  Both of these stages 

are fully differential.

The input gain stage runs at extremely 

high voltages.  In fact, the 200 volts used 

by this stage is one of the reasons why the 

C250 sounds so open and musical even 

during the loudest passage.

All the C250’s 30 dB of gain is produced 

by the input gain stage.  This stage is com-

pletely independent from the output cur-

rent gain stage.  The input stage is fed by 

its own regulated power supply that gets 

its power from a built in Power Plant.

Because the input gain stage has no inter-

action with the output stage, the Classic 

250 sounds the same on virtually any loud-

speaker load.

Our Power Plant AC regenerators have 

revolutionized power within people’s 

homes forever.  Now it is available in a 

specially tuned version designed to en-

hance the performance and long term reli-

ability of the C250.

The 40 watt Power Plant inside the C250, 

with its own discrete and custom wound 

toroidal transformer, independently powers 

the entire input gain stage and was hand 

tuned to maximize the amp’s performance.

 

After hours of listening tests we finally 

settled on one of our original Power Plant 

favorites, 120 Hz sine wave.  This provides 

the cleanest and most open sound for the 

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