6BK7B

Miniature 9-pin medium-mu twin triode engineered specifically with a internal shielding structure to prevent signal cross-talk in VHF television cascading RF amplifier tuners. Equivalents: 6BK7, 6BK7A. Real-Life Examples: RCA and Admiral television VHF tuner modules, vintage consumer standalone FM boosters, custom low-noise laboratory amplifiers. [1]