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The 6J6  (European: ECC91) (P/N 154-0032-00) is a high-frequency dual triode vacuum tube with a 6.3 V, 0.45 A heater.

Introduced in 1939/1940, it was one of the earliest tubes with a miniature 7-pin B7G base. It is used in the 104/104A, 511/511A, 512, 517/517A and possibly other instruments.