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Two New Converter Valves

Radiotronics, April 19, 1938.
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Anurag Aggarwal sent the attached PDF file to the museum in 2016. The article on the mixers indicates the improvement that the 6K8 with the separate oscillator triode made to the stability of broadcast receivers when compared to the susceptibility of 'pulling' that could occur with the heptode or Pentagrid converted then in use. The 6K8 became one of the Magic Three valves that formed the heart of most receivers from then on.

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