6J6

Miniature 7-pin medium-mu twin triode with a shared common cathode, engineered for balanced push-pull RF mixer, oscillator, and wideband computer switching circuits. Equivalents: 6J6WA, 6101, ECC91, CV4031, M8081, 6CC31. Real-Life Examples: IBM 701 Electronic Data Processing Machine (early mainframe), Dumont RA-103 TV tuner, Gonset Communicator II VHF ham transceiver.