Base B8B

The B8B, or Loctal, base came into use in America in 1939, as the all glass production techniques became possible. The first use in the UK was in 1947.

On the whole the B8B range of valves was not a long-term success, being knocked sideways by B7G and then annihilated by B9A before really gaining a market niche.

The pins are hard and inside the envelope they provide the supports for the electrodes. As the pins are equi-spaced around the circumference of the circle, a locating spigot is required to provide a positive registration with the socket.

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