Interactive Valve Data Sheets
Interactive VALVE DATA SHEETS and amp modeling
Experiment with these controls to get a feel for how valve amplifiers behave. You can see how changing the operating conditions affects the performance.
The power output, power dissipation and, if you wish to use cathode bias, the value of the cathode resistor is calculated.
Remember to add the drop across the cathode resistor to the anode voltage to find the supply voltage if you do use cathode biassing.
You can use the results to create your own design.
(a) The bias control only applies to the push-pull option.
(b) The plate load resistance is shown as plate to plate resistance in push-pull.
(c) The push-pull load line is only drawn up the the point where the grid volage is zero, thereafter the grid is held at this maximum and so the load line follows the Vg=0 curve
(d) The power output is calculated as though you are generating a pure sine wave. This will never be true due to non-linearities. Also the screen grid is held at the voltage specified. In most amplifiers they will be fed via resistors, the power supplies will sag and the transformer will have losses. In practice, expect around 30% less than this.
(e) There might be bugs... let us know if you find any!