Perreaux 350 Stereo Amplifier

These amplifiers are BRAND NEW and boxed.

One Black and one Silver.

The Prisma 350 is a 350W per-channel stereo power amplifier. The high power output allows the 350 to effortlessly drive any loudspeakers with the precision, detail and authority that Perreaux products are renowned for.

The ability to extend deep into the lower octaves with control and finesse delivers instruments and voices with lifelike heft, body and scale. Sonic transparency is deep at the heart of the 350, allowing the musicians artistic prowess to be realised in its entirety and as intended by the mastering engineer. As with all Perreaux products, the design is completely solid state, featuring the finest audiophile grade componentry throughout.

Ultra Stiff Power Supply
The 350 incorporates a massive custom designed, toroidal power transformer, employing unusually heavy gauge wire that reduces copper losses to a minimum. An electrostatic shield prevents AC line borne interference from entering the signal path. The power supply filter capacitors, totaling 60,000uF (30,000uF per channel), have exceptionally low inductance and internal resistance. They charge and discharge in response to load demand far more rapidly than conventional storage capacitors and are capable of delivering the instantaneous current required by the output stages, providing optimum dynamic range and transient response. The wiring from the power supplies to the output boards is designed for unimpeded transmission of the required current and voltage and utilizes heavy gauge, tinned copper wire cables. Since power supply leads radiate at signal frequencies, all wiring is carefully loomed to minimise this effect.

Hybrid Class-A/AB
The bi-polar transistors used in the 350 are operating in Class-A. This avoids the crossover notch distortion and the resulting odd-order harmonics present, to some degree, in all other classes of operation. The devices used in the 350 output stage are MOSFETs, which with high quiescent current circuitry, are run in the equivalent of Class-A to 10 watts. Beyond this point the output class is technically Class AB (hence the hybrid nomenclature), but with a major difference. The combination of MOSFET characteristics and their application in this circuitry, result in crossover distortion so minimal that it is virtually non-existent.

MOSFET Output Stage
The 350 output stage takes full advantage of the unique qualities of MOSFET devices and in many ways they are superior to bi-polar transistors. A major advantage is their tendency to draw less current over a large section of the power bandwidth as their temperature rises (Negative Temperature Coefficient), hence self stabilising thermally, whereas bi-polar transistors draw more current as their temperature rises (Positive Temperature Coefficient) and protection circuits become mandatory to prevent thermal runaway and eventual self destruction. MOSFETs have the ability to swing fully across the amplifier’s internal DC voltage and are therefore true “rail-to-rail” devices. Using MOSFETs encourages the highest performance from the balance of the internal amplifier circuitry.

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