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High-voltage shunt regulator tube

vacuum tube (usually beam tetrode or triode) for regulating high voltage supply to the cathode ray tube

Pronunciation
/haɪ - ˈvoʊltɪʤ ʃənt ˈrɛɡjəˌleɪdər tjub/
/hʌɪ - ˈvəʊltɪʤ ʃʌnt ˈrɛɡjʊleɪtə tjuːb/