From Longman Dictionary of Contemporary Englishtransistor radiotranˌsistor ˈradio noun [countable] old-fashioned TCBDHa small radio that you can carry around with you
Examples from the Corpus
transistor radio• These sets are no bigger than a transistor radio and cost as little as $ 100 at the nearby discount electronics store.• Also his transistor radio and his pocket piece of purple fluorite.• More stories, more coffee and another try with Pete's transistor radio.• The wrappings had come off: it was a shattered transistor radio.• He disliked the transistor radio he'd saved up for to get Lavinia for her birthday three years ago. 