History 6L6

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rca s first version octal base tube. base had metal, rather glass, envelope. later versions, including 6l6g, 6l6ga, 6l6gb, 5881, 5932, 7027, , final version 6l6gc had glass envelopes, made radiation cooling of anode easier. voltage , power rating of 6l6 series gradually pushed upwards adding features such micanol base, thicker plates, thicker grid wires, grid cooling fins, , special ultra-black plate coatings. original metal version rated 19 watts dissipation while later 6l6gc rated 30 watts. w in descriptor, in 6l6wgb, identifies tube designed mechanically rugged environments, such military or airborne use.







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