250TL
Triode · DHT · UX-4 · 1938
“Eimac transmitting triode. Extreme power SET.”
Power triode delivering 250W for push-pull and SET designs
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
GAIN14%
POWER100%
DRIVE97%
LINEARITY93%
EXECUTIVE SUMMARY
The 250TL is a directly-heated triode from Eimac, introduced around 1938. It provides a gain factor (μ) of 14 with 3100Ω plate resistance. Commonly used in transmitting (set) applications. Eimac transmitting triode. Extreme power SET.
APPLICATIONS
SET outputPush-pull output
Generic triode transmitting (set) stage
• PA/public address
HISTORY
Introduced1938ManufacturerEimacEquivalentsVT-130
Pre-WarSPECIFICATIONS
Heater Voltage5V
Heater Current10.5A
Max Plate Voltage3000V
Max Power250W
Sensitivity4.5 mA/V
Gain Factor14
Internal Impedance3.1kΩ
PinoutUX-4
Era1938
RarityRare
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.