2A3-T
Directly heated cathode medium-power dual triode, for Class A₁, AB₁ amplification
High-transparency lead-free large glass envelope design, which accelerates internal heat dissipation, while bringing exquisite appearance and elaborate craftsmanship, highlighting the premium quality of the tube.
Filament Heating
Filament Voltage (Uf): 2.5V
Filament Current (If): 2.5A
Absolute Maximum Ratings
Maximum Plate Voltage: 300V
Maximum Plate Dissipation Power: 15W
Grid Resistance
- Self-bias: 0.5MΩ
- Fixed bias: 0.05MΩ
Interelectrode Capacitance
Input Capacitance: 7.5pF
Output Capacitance: 16.5pF
Transition Capacitance: 5.5pF
Static Parameters
Plate Voltage (Ua): 300V
Grid Bias Voltage (-Ug): 45V
Plate Current (Ia): 60mA
Transconductance (Gm): 5.25mA/V
Internal Resistance (ri): 0.8kΩ
Amplification Factor (μ): 4.2
Output Power (Pout): 3.5W
Recommended Operating Conditions (Reference Values)
Single-tube Class A₁ Amplification (Fixed Bias)
Ua: 250V
-Ug: 45V
Load Resistance RL: 2.5kΩ
Static Plate Current Ia(0): 60mA
Gm: 5.25mA/V
ri: 0.8kΩ
μ: 4.2
Pout: 3.5W
Total Harmonic Distortion Dtot: 5%
Push-Pull Class AB₁ Amplification
| Parameter |
Fixed Bias |
Self Bias |
Unit |
| Ua |
300 |
300 |
V |
| -Ug |
62 |
Rk=780Ω |
V |
| RL |
3 |
5 |
kΩ |
| Peak Grid Voltage Ūg(pk) |
87 |
110 |
V |
| Ia(0) |
80 |
80 |
mA |
| Ia(max.sig) |
140 |
100 |
mA |
| Pout |
15 |
10 |
W |
| Dtot |
2.5 |
5 |
% |
For delivery time:
Generally, we will dispatch the items within 7 days upon order confirmation; some items may need 15~21 days to get ready for delivery, then we will try our best to dispatch as soon as possible, or we will contact you and offer advice.
For Bulk order:
If you would like to place a bulk order, please contact us for better price and better delivery cost.
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