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Amplification lamp, which has an anode, cathode and control grid, called the "transistor" (three-electrode tube). The transistor is widely used in low frequency amplifiers, as well as VHF equipment.
Control grid is located close to the cathode, and the voltage across it strongly affects the magnitude of the anode current. For positive voltages on the grid, it gets some of the electrons - there is grid current. The capacitance C is called the entrance capacity of the lamp, as through it an alternating current "get through" from the plate circuit to grid. In other words, due to the capacitance C arises an inverse relationship between the anode and the grid (the opposite effect of the anode to the grid), which can severely degrade the amplifying properties of the lamp or lead to self-cascade. As a result of self (this phenomenon, we take a closer look later) into a power generator and provides the output AC voltage even in the absence of any input signal.

A second drawback of the transistor due to the fact that when working in the lamp voltage amplifier stage is changed to its anode and sometimes it can be very much diminished. This is because the anode voltage of the battery falls (loss) on the resistance of the anode load. The more plate current, the greater the voltage drop across the load and the smaller portion of the anode voltage battery is supplied to the anode tubes. When under the influence of the amplified signal plate current is greatly increased, the minimum voltage at the anode may be only a few volts. Because of the decrease in voltage on the anode attracts electrons it badly, resulting in an undesirable decrease in anode current
To eliminate these disadvantages between the control grid and anode is placed another, the fourth, the electrode, the so-called soft (shield) grid That the capacitor C is connected to the cathode. Such a reinforcement tube with four electrodes was called "tetrode".