Ampera
WE437A
Triode · IHT · 9-pin Magnoval · 1956
“Holy grail small triode. ~2W SE. Legendary.”
Medium-gain triode for driver and line stage applications
GAIN FACTOR0
PLATE IMPEDANCE0Ω
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN40%
POWER18%
DRIVE99%
LINEARITY80%
EXECUTIVE SUMMARY
The WE437A is a indirectly-heated triode from Western Electric, introduced around 1956. It provides a gain factor (μ) of 40 with 870Ω plate resistance. Commonly used in power (se) applications. Holy grail small triode. ~2W SE. Legendary.
APPLICATIONS
Push-pull outputHeadphone output
Generic triode power (se) stage
• Hi-Fi stereo• Headphone amp
HISTORY
Introduced1956ManufacturerWestern ElectricEquivalents6S45P-E, 6C45Pi
Golden AgeSPECIFICATIONS
Heater Voltage6.3V
Heater Current0.4A
Max Plate Voltage160V
Max Power7W
Sensitivity46 mA/V
Gain Factor40
Internal Impedance870Ω
Pinout9-pin Magnoval
Era1956
RarityCollector
Input Capacitance4.5pF
Miller Capacitance0.07pF
Output Capacitance2.8pF
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.