ECC81 / 12AT7 Vacuum tube - Twin Triode

The vacuum tube ECC81 or 12AT7 is the double triode tube. The dimensions and connections of the tube are the same as for ECC83 tube. The following data are for the ECC81 tube manufactured by JJ Electronic.


Electrical Data:

Cathode heater:

> Heater Voltage Series/Parallel: 12.6/6.3 V;
> Heater Current Series/Parallel: 150/300 mA;

Typical Characteristics:

> Plate Voltage: 250 V;
> Grid Voltage: -2 V;
> Plate Current: 10 mA;
> Transconductance: 5.5 mA/V;
> Input Resistance: 11 kOhms;
> Amplification Factor: 60.

Limiting Values:

> Plate Voltage: 300 V max;
> Plate Dissipation: 2.5 W max;
> Cathode Current: 15 mA max;
> Negative DC Grid Voltage: -50 V max.



Source: JJ Electronic.