+The D3a is a revered small-signal [Triode](/wiki/Triode) [Vacuum Tube](/wiki/Vacuum_Tube), often found at the heart of high-fidelity audio designs. Prized for its linearity and low noise, it remains a favorite among discerning audiophiles and engineers for demanding amplifier stages.
+## See also
+- [Valve Amplifier](/wiki/Valve_Amplifier)
+- [Audio Circuit](/wiki/Audio_Circuit)
+- [Electronics](/wiki/Electronics)