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The 3S4 is a directly heated audio pentode, also known as a beam tetrode,
that was developed in the late 1940s for battery-powered operation in portable
radios. It has two filaments which can be used in parallel or in series.
Pinout as seen from the bottom of the valve.
➤ 3S4 datasheet
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© Crypto Museum. Created: Monday 10 May 2021. Last changed: Monday, 10 May 2021 - 06:27 CET.
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