Ampera
EL509
Pentode · IHT · Magnoval + Top Cap · 1963
“High-power sweep pentode. Massive headroom.”
Power pentode delivering up to 35W in pentode, UL, or triode mode
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN100%
POWER88%
DRIVE92%
LINEARITY28%
EXECUTIVE SUMMARY
The EL509 is a indirectly-heated pentode from Philips·Svetlana, introduced around 1963. It provides a gain factor (μ) of 144 with 8000Ω plate resistance. Commonly used in power (se/pp) applications. High-power sweep pentode. Massive headroom.
APPLICATIONS
Power output
Generic pentode power (se/pp) stage
• PA/public address
HISTORY
Introduced1963ManufacturerPhilips·SvetlanaEquivalents6KG6
Late ProductionSPECIFICATIONS
Heater Voltage6.3V
Heater Current2.3A
Max Plate Voltage550V
Max Power35W
Sensitivity18 mA/V
Gain Factor144
Internal Impedance8.0kΩ
PinoutMagnoval + Top Cap
Era1963
RarityModerate
Input Capacitance18pF
Miller Capacitance0.5pF
Output Capacitance12pF
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.