NAT Audio design and produce high-end vacuum tube pre-amplifiers and power amplifiers. The main features of these products are triode configuration, short signal path, zero or low feedback, single ended concept. Whenever it is possible, New Old Stock (NOS) tubes of the world’s most famous manufacturers (General Electric, RCA, CEI Electron Tube, EI, etc.) are implemented. NAT power amplifiers features output transformers wound by hand. Unique implementation of these single-ended output transformers provides extremely wide frequency response (example photo left: power amplifier NAT SE1 has a frequency response from 5 Hz to 50 kHz). All NAT audio components are hand made and are exposed to a rigorous burn-in test before delivery.