833A
Triode · DHT · Special · 1938
“Monster transmitting triode. 1kW capable.”
Power triode delivering 300W for push-pull and SET designs
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
GAIN35%
POWER100%
DRIVE92%
LINEARITY83%
EXECUTIVE SUMMARY
The 833A is a directly-heated triode from RCA·GE·Penta, introduced around 1938. It provides a gain factor (μ) of 35 with 7800Ω plate resistance. Commonly used in transmitting (set) applications. Monster transmitting triode. 1kW capable.
APPLICATIONS
SET outputPush-pull output
Generic triode transmitting (set) stage
• PA/public address
HISTORY
Introduced1938ManufacturerRCA·GE·PentaEquivalentsFU-33
Pre-WarSPECIFICATIONS
Heater Voltage10V
Heater Current10A
Max Plate Voltage3000V
Max Power300W
Sensitivity4.5 mA/V
Gain Factor35
Internal Impedance7.8kΩ
PinoutSpecial
Era1938
RaritySought-after
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.