Sharp-Cutoff Pentode
The Valvo EF91 Vacuum tube is a miniature type used as
an RF amplifier in television and FM receivers. It
requires a miniature 7-contact socket.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage ................ 250 V
Preferred Substitutes ......................... 6AM6