2A3-TII is a direct-heated cathode power double triode, it is used in classA1, AB1 amplifier.

Heater
Uf ………………………… 2.5 V
If…………………………2.5 A

Maximum Rating
Ua…………………………300 V
Pa…………………………15 W
Rg
with cathode bias…………………………0.5 MΩ
with fixed bias…………………………0.05 MΩ

Direct Interelectrode Capacitances
input………………………… 7.5 PF
output…………………………16.5 PF
grid to plate…………………………5.5 PF

Static parameter
Ua………………………… 300 V
-Ug………………………… 45 V
Ia………………………… 60 mA
Gm………………………… 5.25 mA/V
ri………………………… 0.8 kΩ
μ………………………… 4.2
Pout…………………………3.5 W