50
Triode · DHT · UX-4 · 1928
“Between 2A3 and 300B. Powerful DHT SET output.”
High-power directly-heated triode for single-ended amplification
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
GAIN4%
POWER63%
DRIVE98%
LINEARITY95%
EXECUTIVE SUMMARY
The 50 is a directly-heated triode from RCA·GE, introduced around 1928. It provides a gain factor (μ) of 3.8 with 1900Ω plate resistance. Commonly used in power (set) applications. Between 2A3 and 300B. Powerful DHT SET output.
APPLICATIONS
SET outputPush-pull outputHeadphone output
Generic triode power (set) stage
• Hi-Fi stereo• Headphone amp
HISTORY
Introduced1928ManufacturerRCA·GEEquivalentsVT-50
Pre-WarSPECIFICATIONS
Heater Voltage7.5V
Heater Current1.25A
Max Plate Voltage450V
Max Power25W
Sensitivity2 mA/V
Gain Factor3.8
Internal Impedance1.9kΩ
PinoutUX-4
Era1928
RarityCollector
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.