VPA

About the VPA

The Nagra VPA consists of two mono block vacuum tube power amplifiers using matched pairs of 845 output tubes, delivering 50 Watts of power through a pure class A push-pull triode output stage without negative feedback. Introduced in 1998, it has become a reference amplifier for audiophiles worldwide due to its clarity, transparency, and ability to drive difficult speaker loads including electrostatic and low-impedance dynamic speakers. The design features fully balanced circuitry from input to output to minimize distortion and phase shift, proprietary Nagra output transformers to avoid low-frequency saturation and high-frequency ringing, and a zero negative feedback architecture for improved speaker matching. The monoblock design enhances channel separation and signal integrity, allowing placement close to speakers for better damping. Inputs include balanced XLR and unbalanced gold-plated RCA connectors, with outputs for 4, 8, and 16 ohm speaker loads. The 845 tubes undergo a 24-hour burn-in and computer-assisted matching. The amplifier is housed in machined aluminum towers and weighs 13.5 kg (30 lbs) each. It is known for its fast rise time, excellent slew rate, and superb sound-stage delineation, making it a timeless high-end vacuum tube amplifier.