Single Evo combines NAT’s single-ended valve power-amplifier architecture with source selection and level control in one integrated chassis. The signal path remains pure Class A and zero global feedback, preserving the company’s emphasis on triode simplicity while reducing the number of separate components and interconnects in the system.

Custom output transformers and a substantial power supply provide separate loudspeaker connections for different load requirements. Remote volume control, multiple line inputs and carefully managed start-up make the amplifier practical for a complete high-end system.

The internal construction is hand wired and uses selected valves, precision passive parts and high-quality connectors, all housed in a heavily machined aluminium enclosure with a protective tube cage.