Two of the transistors formed the project’s audio amplifier, leaving the radio part to just one device. How on earth could a single transistor form the heart of a radio receiver with enough ...

Those go to a circuit board he designed which modulates the carrier with the audio signal using a single transistor ... followed by a transistor amplifier for the modulated wave, then a diode ...

Technology journalist specializing in audio ... Most transistor amps in the 1960s were integrated models with the preamp and power amp stages—and often a radio tuner—in a single box.