Vacuum I.N. 

Full Battery Powered Vacuum Tube MM Phono Stage

NAT set a new standard in phono stage state-of-the art product by new approach-vacuum based inverse network realised in model Vacuum I.N. . Standard inverse network is based on RC or even better RLC type as main part of the signal path. NAT put vacuum field medium instead. Vacuum I.N is based on 14 vacuum tubes in full absolute zero feedback configuration to form uncompromised MM phono stage!

MC transformer 

NAT MCX - MC step-up stage

Signature Phono 

Battery Powered Vacuum Tube Phono Stage

NAT set a new standard in Phono state-of-the art product by new approach-vacuum based inverse RIAA network in model Signature Phono Vacuum RIAA. Standard inverse RIAA network based on resistor or even better inductor as main part in the signal path, but NAT put Vacuum field medium instead. Phono stage contains 8 vacuum tubes in full zero feedback configuration.