crystal set

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crystal set

[′krist·əl ‚set]
(electronics)
A radio receiver having a crystal detector stage for demodulation of the received signals, but no amplifier stages.
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References in periodicals archive ?
A montage of audio and video clips will play on continuous loops on the period pieces, progressing from early crystal radios to I-Pods and plasmas.
I remember my brother, he was working where they made the little crystal radios, and he brought one home.