Preamps
2A3-TII is a direct-heated cathode power dual triode, used in A1 and AB1 class amplifiers.
Heater
2.5V voltage
If 2.5 A
Maximum Ratings
UA300 No.5
Pa15W
A
Cathodic bias 0.5 M
Fixed deviation 0.05 M
Direct interelectrode capacitance
Input 7.5 PF
Output 16.5 PF
Grid to plate 5.5 PF
Static parameters
UA300V
-Ug45V
Current 60 mA
On-resistance 5.25 mA/V
0.8 thousand
4.2
Water output 3.5W
Recommended operating conditions (reference values)
Class A1. Single tube. Fixed bias.
250V
-Ug45V
RL2.5 thousand
Current (0) 60 mA
Gm5.25 mA/V
0.8 K
4.2
Water output 3.5W
Total 5%
Push-full.class AB1
Fixed bias cathode bias
Ua300 300V
-Ug62Rk=780V
RL3 5K
üg(pk)87110 V
Current (0) 8080 mA
Ia (maximum signal) 140100 mA
Output power 15 10 watts
Total 2.55%