Audio Amplifier One Transistor for Crystal Detector Radio Receiver
How to Make a Transistor Radio – Mother Earth News
1-Transistor-Reflex-Superhet (~1960) » The Universe of the Lectron System
One Transistor FM Transmitter
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File:Vintage Regency TR-1 Transistor Radio, Mahogany Color, 4 Transistors, Made in USA (9804504753).jpg - Wikimedia Commons