EF12
EF183
EF184
EF22
EF366J7
EF39Remote Cutoff R.F. pentode. Most common commercial uses were as an I.F. amplifier or as a superheterodyne mixer, aka 1st detector. Also used in test equipment. Octal version of type 78. This type included a top-cap connection for the control grid. Later version, type 6SK7, had its control grid connection on pin 4.
EF40
EF41
EF42
EF43
EF50
EF51
EF55
EF6
EF80Sharp Cutoff R.F. Pentode (Used in Australian TV 39 MHz I.F. Strips and seen in Wien Bridge audio oscillator), E80F used in early computers.
EF806BX6Sharp Cutoff R.F. Pentode (Used in Australian TV 39 MHz I.F. Strips and seen in Wien Bridge audio oscillator), E80F used in early computers.
EF800 TFK
EF83
EF856BY7Remote Cutoff R.F. Pentode (Used in Australian TV 39 MHz I.F. Strips)
EF86Audio Pentode used in microphone pre-amps and audiophile gear
EF896DA6R.F. Pentode used in AM/FM radios manufactured outside North America.
EF906BX65749, 6BA6, EF90?, W727 R.F. pentode
EF91Miniature V.H.F. Sharp cut-off Pentode (Used in old “Radiosonde” weather balloon transmitters, receiver front ends and contemporary audio equipment) B7G, (Miniature 7 pin) base
EF92
EF936BA6Medium Cutoff R.F. Pentode (Often encountered in Car Radios)
EF946AU6Sharp-cutoff pentode
EF956AK55654, 6AK5, EF95, CV4010, 62H1P, 408A V.H.F pentode; common in old radar IF amplifiers.
EF956AK65654, 6AK5, EF95, CV4010, 62H1P, 408A V.H.F pentode; common in old radar IF amplifiers.
EFL200
EFM1