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Answer for the clue "The branch of electronics dealing with thermionic phenomena (especially thermionic vacuum tubes) ", 11 letters:
thermionics

Word definitions for thermionics in dictionaries

WordNet Word definitions in WordNet
n. the branch of electronics dealing with thermionic phenomena (especially thermionic vacuum tubes)

Usage examples of thermionics.

And the development itself will in all probability be an outgrowth of thermionics, which is the branch of science which deals with the influence of heat on matter in generating atomic or sub-atomic electrically charged particles, ions and electrons.

The principles of the thermionics have been known for nearly two hundred years, incidentally.