Ampera
EF94
Pentode · IHT · 7-pin Miniature · 1950
“Miniature preamp pentode.”
Small-signal pentode for low-noise voltage amplification
Datasheet ↗SPICE
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN0%
POWER8%
DRIVE50%
LINEARITY75%
EXECUTIVE SUMMARY
The EF94 is a indirectly-heated pentode from Philips, introduced around 1950. Commonly used in preamp applications. Miniature preamp pentode.
APPLICATIONS
Voltage amplifier
Generic pentode preamp stage
HISTORY
Introduced1950ManufacturerPhilipsEquivalents6AU6 class
Golden AgeSPECIFICATIONS
Heater Voltage6.3V
Heater Current0.1A
Max Plate Voltage250V
Max Power3W
Sensitivity2.2 mA/V
Gain Factor—
Internal Impedance—
Pinout7-pin Miniature
Era1950
RarityCommon
Input Capacitance5pF
Miller Capacitance0.003pF
Output Capacitance3.5pF