Ampera
ECC83
Dual Triode · IHT · 9-pin Noval · 1947
“European 12AX7.”
High-gain dual triode — the standard for guitar and hi-fi preamps
Datasheet ↗SPICE
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
Cgk0pF
Cgp0pF
Cpk0pF
GAIN100%
POWER3%
DRIVE38%
LINEARITY50%
TYPICAL OPERATING POINT
EXECUTIVE SUMMARY
The ECC83 is a dual indirectly-heated triode from Mullard·Telefunken, introduced around 1947. It provides a gain factor (μ) of 100 with 62.5kΩ plate resistance. Commonly used in preamp applications. European 12AX7.
APPLICATIONS
Voltage amplifierHigh-gain preampPhase splitter
Fender Tweed preampMarshall JTM45 V1Vox AC30 preampMarantz 7 phono stage
• Guitar amp• Hi-Fi stereo• Headphone amp• Studio/recording
VS 12AX7
HISTORY
Introduced1947ManufacturerMullard·TelefunkenEquivalents12AX7
Golden AgeSPECIFICATIONS
Heater Voltage6.3V
Heater Current0.3A
Max Plate Voltage300V
Max Power1W
Sensitivity1.6 mA/V
Gain Factor100
Internal Impedance62.5kΩ
Pinout9-pin Noval
Era1947
RarityCommon
Input Capacitance1.6pF
Miller Capacitance1.7pF
Output Capacitance0.46pF