Ampera
PX25-EmissionLabs
Triode · DHT · UX-4 · 2005
“Enhanced PX25.”
High-power directly-heated triode for single-ended amplification
Datasheet ↗SPICE
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN5%
POWER93%
DRIVE99%
LINEARITY95%
TYPICAL OPERATING POINT
EXECUTIVE SUMMARY
The PX25-EmissionLabs is a directly-heated triode from Emission Labs, introduced around 2005. It provides a gain factor (μ) of 4.7 with 1350Ω plate resistance. Commonly used in power (set) applications. Enhanced PX25.
APPLICATIONS
SET outputPush-pull outputHeadphone output
Generic triode power (set) stage
• Hi-Fi stereo• Headphone amp• PA/public address
VS PX25
HISTORY
Introduced2005ManufacturerEmission LabsEquivalentsPX25
ModernSPECIFICATIONS
Heater Voltage4V
Heater Current2A
Max Plate Voltage600V
Max Power37W
Sensitivity3.5 mA/V
Gain Factor4.7
Internal Impedance1.4kΩ
PinoutUX-4
Era2005
RaritySought-after
Input Capacitance6.5pF
Miller Capacitance14pF
Output Capacitance3.5pF