BIAS SWITCH

This switch on the right of the panel alters the operating bias of the amplifier. The switch operates on a pulse system and lights the Bias LED when the amplifier is switched to Class A. In Class AB the LED is off.

BIAS AB: This position reduces the bias on the output stage to operate the amplifier in Class AB. This is a bias configuration used by the majority of high fidelity amplifier designers for their products. In Class AB your Plinius SA-250 produces very high quality sound, suitable for all occasions where ‘super critical’ listening is not a priority. The quality of performance in this mode may exceed that of many other amplifiers so a dual benefit exists in that this facility provides the user with a much cooler operating temperature, and a much reduced demand on electricity particularly at idle (while the amplifier is not reproducing music). This unique feature allows you to leave the Plinius SA-250 switched ON at all times, rendering the amplifier ready for use and requiring only a few minutes of warm-up in Class A before the very best of the amplifier's sonic qualities may be experienced.

BIAS A: This position provides a true Class A bias to the output stage therefore ensuring the optimum performance of the amplifier during all listening events. Class A amplifiers run hotter than Class AB amplifiers, hence our specially designed and distinctive heat sinks. Operating the amplifier in BIAS A necessitates two precautions that should be observed.

1.On switching to BIAS A, the temperature of the amplifier will quickly increase and the amplifier will become quite hot. Once again we remind you to ensure that you have left adequate space around the amplifier for ventilation. Ensure that no objects are resting on the amplifier and check that the heat sink (cooling fins) are not obstructed in any way.

2.The current required from the mains supply in BIAS A is approximately 1,000 watts, similar to a small electric heater. The amplifier should not be connected to a wall outlet that is shared with other heavy current appliances such as heaters or electric motors. If in doubt, check with your Plinius dealer for advice.

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Plinius Audio SA-250 manual Bias Switch
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SA-250 specifications

The Plinius Audio SA-250 is a remarkable power amplifier that has garnered attention for its robust build quality and superior sound performance. Known for its elegant design and advanced technology, the SA-250 is a favorite among audiophiles and music enthusiasts who seek high-fidelity audio experiences.

One of the standout features of the SA-250 is its solid-state architecture, which leverages a fully complementary output stage to ensure minimal distortion and maximum power efficiency. This amplifier is rated at 250 watts per channel into 8 ohms, providing ample power to drive a variety of loudspeaker types. With a dynamic power that reaches up to 500 watts into 4 ohms, the SA-250 can handle even the most demanding audio setups with ease.

The amplifier incorporates Plinius' proprietary New Zealand-crafted transformer, which offers excellent energy storage and helps maintain stable performance. This transformer design plays a crucial role in providing the SA-250 with a smooth, dynamic sound that retains musicality and clarity across all frequencies. The amplifier’s warm, analog sound signature is a testament to Plinius' commitment to creating equipment that enriches the listening experience.

Additionally, the SA-250 utilizes advanced circuitry to minimize signal degradation while maximizing bandwidth. Features such as premium-quality components, an extensive power supply, and meticulously engineered circuit layouts work together to produce a refined soundstage, detailed imaging, and remarkable instrument separation. The amplifier’s design not only emphasizes performance but also aesthetic appeal, with a polished aluminum chassis that fits seamlessly into any audio setup.

The amplifier's operational flexibility is another highlight, as it includes both balanced and unbalanced inputs, allowing for easy integration with a variety of preamps and audio sources. Its user-friendly controls and indicators further enhance the listening experience, making it simple to operate even for those new to high-end audio systems.

In summary, the Plinius Audio SA-250 stands out as a powerful and elegant amplifier that embodies the ideal balance of technology and artistry. Its ability to deliver a rich and immersive sound, paired with its reliable performance and sophisticated design, solidifies its position as a top choice for audiophiles seeking ultimate audio quality. Whether used in a dedicated listening room or as part of a larger home theater setup, the SA-250 continues to impress and inspire.
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