12BY7

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The 12BY7 is a miniature 6.5 W power pentode. The 12BY7A (European equivalent EL180) is a compatible and slightly improved version.

Both are all-glass types with a B9A (Noval) miniature 9-pin base and share the EIA 9BF pinout with a number of other miniature pentode tubes of the era.

Tek part number: 154-0047-00 (12BY7A)

Data sheets and Links

9BF socket diagram
9BF socket diagram

Used in

  • the output stage of the 1121
  • the first stage of the 535, 545A, and 555

Pictures