+The **12B5** is a specific [vacuum tube](/wiki/vacuum_tube), typically a power pentode. It was widely used in [audio amplifier](/wiki/audio_amplifier) circuits, known for its ability to drive loudspeakers with clarity.
+## See also
+- [Pentode](/wiki/pentode)
+- [Electronics](/wiki/electronics)
+- [Transistor](/wiki/transistor)
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