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Subminiature vacuum tube

Type of very small, flexible-lead, all-glas vacuum tubes (excludes nuvistors)

Pronunciation
/sʌbˈmɪnɪʧə ˈvakjuːm tjuːb/
/ˌsəbˈmɪniəˌʧʊr ˈvækˌjuəm tjub/