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The Mullard EF91 is a pentode vacuum tube (valve) that was widely used in the mid-20th century for RF (radio frequency) and IF (intermediate frequency) amplification in radios, televisions, and test equipment. It was introduced in the 1940s–1950s as part of Mullard's reliable series of miniature tubes.
Specifications
Widely manufactured in the UK, especially by Mullard, a respected brand for quality vacuum tubes
The EF91/CV138 was used in military, commercial, and broadcast applications
Some variants were ruggedized for military use (e.g., CV138, CV4014)
