Electrontubes is an application to solve different calculations on electrontube circuits. Give initial values and click on calculate button to start calculation. You can perform voltage stabiliser with gas-filled stabiliser tube, current stabilized heater circuit with baretter, grounded cathode amplifier with triode, grounded cathode amplifier with triode and cathode-bypass capacitor, grounded cathode amplifier with triode and negative feedback, mu-follower amplifier with triode, cathodyn phase inverter with triode #1 and #2, grounded cathode cascode amplifier with triodes #1 and #2, AC coupled cathode-follower with triode, and SRPP amplifier with triodes.