The Triple Triode Emerson Multivalve Vacuum Tube

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In March 1927, a company named the Emerson Radval Corporation of New York had what seemed like a great idea, putting three triodes in one tube. A tube with three sections could serve as a detector, oscillator and amplifier in a radio, lowering costs while simplifying the design. So why didn't it catch on? Join Robert Lozier as he examines the Emerson Multivalve tube and the radios that used it.

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very nice video - thanks for taking the time and effort to make it!!. I have just bought a Standardyne, but unfortunately the multivalve filament is open circuit. - Roy.

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