The circuit of the self-oscillating mixer stage, the base bias voltage of the second IF stage from the AF power stage, the unusual IF of 262KHz and the supply voltage of 22.5 V are all characteristic of the device. It was a true international sensation (2).The circuitry of the Regency shows some peculiarities. It was the first mass-produced transistor receiver in the world and arrived earlier than the professional world expected. In the USA on the 18th October 1954, the "Regency TR-1," developed by Texas Instruments was launched on the market. Here we add the following commentary to the article "Telefunken Pocket Radios from 1955-1960" in Funkgeschichte Nr.
Translated from: Gebert W Anmerkungen zu den Schaltungen der ersten Transistorradios Funkgeschichte 115 (1997) 241-44 by W Gebert and M Burgess Comments on the Circuits of the first Transistor Radios
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