Unison Research Simply 845 Tube Integrated Amplifier

The 845 direct-heated triodes are renowned for their warm, harmonically rich, and textured sound. You can expect a lush midrange and a natural, organic presentation that brings a sense of realism to vocals and acoustic instruments.

While 23 watts is modest by solid-state standards, the Simply 845's Pure Class A design provides significant current and authority. It will comfortably drive speakers with moderate to high sensitivity, though it is best paired with efficient designs rather than demanding, low-impedance speakers.

No, the Simply 845 features a self-biasing circuit. This makes tube maintenance straightforward and ensures the amplifier operates at optimal performance levels without requiring manual adjustments or specialized equipment.

Yes, the unit includes a dedicated subwoofer output. This allows you to easily integrate a powered subwoofer into your system if you need to extend the low-frequency response of your speakers.

The amplifier uses a high-quality Japanese-made ALPS RK27 potentiometer. This component is widely respected in audiophile circles for its precise tracking and minimal impact on signal purity, ensuring that volume adjustments remain transparent and accurate.

Transformers are critical to the performance of a tube amplifier, as they handle the impedance matching between the tubes and your speakers. Unison Research winds these in-house to ensure they are perfectly matched to the 845 circuit, resulting in better frequency extension and tighter bass control.