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Intermediate-frequency (if) amplifier

amplifier stage used to raise signal levels in radio and television receivers

Pronunciation
/ˌɪntərˈmidiət - ˈfrikwənsi ( ɪf ) ˈæmpləˌfaɪər/
/ˌɪntəˈmiːdɪət - ˈfriːkwənsi ( ɪf ) ˈamplɪfʌɪə/