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Base B9A

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View of the valve looking into the base from below.

The B9A base was to become the standard for all glass valves from the 1950s and typically was used with tubular envelopes of 20mm diameter. In a 1953 advert Mullard described the mixer ECH81 as being on the Services preferred base.

The pin-outs below refer to the data researched by Keith R Thrower OBE.

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