Unusual tubes

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albertusj

albertusj

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These tubes don't use grids, but rods instead to control electron flow. I own a couple but have not had a chance to build something using them yet. They have directly heated cathodes.

https://www.radiomuseum.org/forum/russian_subminiature_tubes.html?thread_id=200277

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Copyright AJ Bredekamp 2019
 

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