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The Nuvistor has a much lower inter-electrode capacitance than some larger triodes due to the very small spacing between elements, and elements to base. This allowed for efficient use of a triode instead of a pentode, which have higher gain, but also a higher noise figure, in TV tuners. RCA seems to be among few manufacturers to use them in TV designs.
I have also seen them used in Amateur radio designs, as well as commercial applications. The most common types are 6CW4, and 6DS4. Some special types have grid caps.
Kevin
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stromberg6
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