Balanced Dual Mono Zero Feedback Vacuum Tube Line Stage
NAT Audio introduced tube balanced preamplifier called "Symmetrical New". New line stage is completely in dual mono topology also with zero feedback all triode vacuum tube design.
Reference Zero Feedback Hybrid Balanced Line Stage
Magnetic is a newest reference point line stage made by NAT standards – transformer coupled, class A with zero feedback circuit configuration. Special selected vacuum tube with j-fet is used - represent high technology in both industrial tube and solid state manufacturing.
Reference Absolute Zero Feedback Vacuum Tube Line Stage
Magnetostat is a new reference point line stage made by NAT standards – transformer coupled pure triode class A with absolute zero feedback circuit configuration. Military grade type 6S31B-R output tube is used - represent high technology in vacuum tube manufacturing.