Denk, Robert
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Scan day: 28 February 2014 UTC
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Description: The inventor of the tubeless radio used an unknown solid-state effect, which was never rediscovered.
Robert Denk's invention of the tubeless receiver The first transistor radio in the world Note: This text is a summary of the content of the The transistor radio was a sensational German invention. The first transistor radio in the world was made in February 1948 by Robert Denk, a Sudeten German refugee, in Witzenhausen near Kassel (Germany) in refugee barracks. The circuit, a single-tuned receiver, essentially consisted of a pass-band capacitor with a coil, a selenium dry rectifier, a transformer and an electrolyte capacity. The main element was a cylindrical aluminium casing, which housed an electrode made of a silver alloy, which was covered by a oxide coating, a central section between a detector crystal and a radio tube. This was the first radio that worked as soon as it was switched on. The operating voltage was 13 V. The reception range was phenomenal, the selectivity excellent and the sound quality superb. However, it did need a good mains filter. The volume was very high even with low input power. The electrode had a very long service life. As a result of the simplicity of the design, any tube radio could be converted into a tubeless radio.
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| Page title: | Robert Denk's invention of the tubeless receiver |
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| Date | Changed: 2006-07-28T04:31:25+02:00 Changed: 2006-06-11T23:08:01+02:00 Changed: 2006-06-11T23:08:01+02:00 |