12AT7-S

Filament Voltage
UH ..................................................... 6.3 (parallel) / 12.6 (series) V
IH ...................................................... 0.30 / 0.15 A

Class A Amplpplification Maximum Ratings (per side)
**Anode Voltage ........................................... 300 V
Grid Voltage ........................................ -50 V
Anode Dissipation Power ........................... 2.5 W
Filament to Cathode Voltage (peak) ................ ±90 V

Grid Resistance
Self-bias ............................................ 1 MΩ
Fixed Bias ........................................... 0.25 MΩ

Inter-electrode Capacitance
                                                          No.1    No.2   
Input Capacitance ................................... 2.2       2.2      pF
Output Capacitance ............................... 0.45      0.35     pF
Cross Capacitance ................................... 1.6       1.6      pF
Electrostatic Parameters
Ua .................................................... 100       250       V
Ia ..................................................... 3.7       10        mA
Gm ................................................... 4         5.5       mA/V
Rk .................................................... 270       200       Ω
μ ........................................................ 60        60
ri (approx) .......................................... 15        10.9      kΩ