Ampera
RS242
Triode · DHT · 4-pin European · 1940
“DHT triode. Smaller RS241 sister.”
Power triode delivering 12W for push-pull and SET designs
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN17%
POWER30%
DRIVE94%
LINEARITY92%
EXECUTIVE SUMMARY
The RS242 is a directly-heated triode from Telefunken, introduced around 1940. It provides a gain factor (μ) of 16.8 with 5600Ω plate resistance. Commonly used in power (se) applications. DHT triode. Smaller RS241 sister.
APPLICATIONS
SET outputPush-pull output
Generic triode power (se) stage
• Hi-Fi stereo
HISTORY
Introduced1940ManufacturerTelefunkenEquivalentsE130, RS242X
Pre-WarSPECIFICATIONS
Heater Voltage3.8V
Heater Current0.76A
Max Plate Voltage350V
Max Power12W
Sensitivity3 mA/V
Gain Factor16.8
Internal Impedance5.6kΩ
Pinout4-pin European
Era1940
RarityCollector
Input Capacitance8pF
Miller Capacitance5pF
Output Capacitance6pF
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.