Ampera
ECC81
Dual Triode · IHT · 9-pin Noval · 1947
“European 12AT7.”
Medium-gain triode for voltage amplification applications
Datasheet ↗SPICE
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
GAIN60%
POWER6%
DRIVE89%
LINEARITY70%
TYPICAL OPERATING POINT
EXECUTIVE SUMMARY
The ECC81 is a dual indirectly-heated triode from Mullard, introduced around 1947. It provides a gain factor (μ) of 60 with 10.9kΩ plate resistance. Commonly used in driver applications. European 12AT7.
APPLICATIONS
High-gain preampPhase splitter
Marshall JCM800 PIFender reverb driver
• Guitar amp• Headphone amp• Studio/recording
VS 12AT7
HISTORY
Introduced1947ManufacturerMullardEquivalents12AT7
Golden AgeSPECIFICATIONS
Heater Voltage6.3V
Heater Current0.3A
Max Plate Voltage300V
Max Power2.5W
Sensitivity5.5 mA/V
Gain Factor60
Internal Impedance10.9kΩ
Pinout9-pin Noval
Era1947
RarityCommon