+The **2a3** is a classic [Vacuum Tube](/wiki/Vacuum_Tube), renowned for its direct-heated triode design. It is highly valued in [Audio Amplifier](/wiki/Audio_Amplifier) circuits, especially for its warm, clear sound reproduction. This power triode remains a favorite among audiophiles for its fidelity and distinctive sonic signature.
+## See also
+- [300B](/wiki/300B)
+- [Triode](/wiki/Triode)
+- [High Fidelity](/wiki/High_Fidelity)
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