Unison Research P40

Product details

Product: Unison Research P40 Integrated Tube Amplifier
Finish: Black chassis
Year of manufacture: 2000s
Service: Major maintenance performed on April 4, 2025

Product description

The Unison Research P40 is a fully analog integrated tube amplifier known for its rich, natural sound. Delivering 2 x 40 watts in Class AB, it features a powerful output transformer design that ensures both control and musicality. The P40 uses EL34 output tubes, resulting in an expressive and fluid soundstage — ideal for classical music, jazz, acoustic recordings, and vocals.

On April 4, 2025, this unit received a full service, including:

• Replacement and re-biasing of the output tubes

• Professional cleaning of the volume potentiometer

Thanks to this maintenance, the amplifier performs at its peak again and is ready for many more years of listening enjoyment.

Functional notes

• Integrated tube amplifier with EL34 output tubes

• Smooth, expressive sound with strong dynamics

• Compatible with a wide range of speakers (4/8 ohm)

Specifications

• Type: Integrated tube amplifier

• Power output: 2 x 40 watts (8 ohms)

• Tube configuration: EL34 output tubes + driver tubes

• Inputs: 5 x RCA line

• Outputs: Speaker (4/8 ohm), Tape Out

• Dimensions: 430 x 200 x 420 mm

• Weight: approx. 23 kg

Weight: approx. 23 kg