WE408A
Pentode · IHT · 7-pin Miniature · 1955
“Sharp-cutoff pentode. 20V heater 6AK5.”
Small-signal pentode for low-noise voltage amplification
TRANSCONDUCTANCE0mA/V
GAIN0%
POWER6%
DRIVE50%
LINEARITY75%
EXECUTIVE SUMMARY
The WE408A is a indirectly-heated pentode from Western Electric, introduced around 1955. Commonly used in preamp / hf applications. Sharp-cutoff pentode. 20V heater 6AK5.
APPLICATIONS
Voltage amplifier
Generic pentode preamp / hf stage
HISTORY
Introduced1955ManufacturerWestern ElectricEquivalents6AK5 (20V heater), 6028
Golden AgeSPECIFICATIONS
Heater Voltage20V
Heater Current0.15A
Max Plate Voltage250V
Max Power2.5W
Sensitivity5 mA/V
Gain Factor—
Internal Impedance—
Pinout7-pin Miniature
Era1955
RarityRare
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.