Pentode
West Germany
The Telefunken EF804 Vacuum tube is a The EF804 is a medium-sized NF pentode for initial stages,
especially for microphone amplifiers. It has high blade strength, low hum and low noise.
Telefunken developed a series of special tubes with a long service life and some special
properties for commercial purposes, federal post offices and broadcasting companies. These tubes
are the EF800, EF802, EF804 and EF804S.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.2 A