We still enjoy listening to radio receivers today because they are always modern
Back in 1948, the first invention of the transistor was published. Since its invention, the transistor has been used in many interesting ways. The transistor is used in hearing aids (because it helps people with hearing impairments), in aviation, for walkie-talkies, portable radios, electronic computers and rockets.

A transistor essentially does the same thing as an electron tube, but even better than a tube. The electron tube was normally used to amplify electronic signals (for example, signals emitted by radio and TV stations). The speaker in the radio and the cathode ray tube in the old TV sets would give only a weak sound or image without such sound amplification. The transistor amplifies the electric waves even though it is much smaller than the classic electronic tube, which consumes less power and practically never burns out.
The current in the electron tube is regulated when it flows through the vacuum, ie in the airless space in the tube. A transistor, however, controls the electric current as the current flows through the solid. Transistors are made of semiconductors (germanium or silicon). A semi-conductor is a material that is a weaker conductor of electric current than metal (copper) but a better conductor than, for example, glass. The advantage of a semiconductor is that an electric current can be conducted through it with negative and positive charges. The transistor is therefore a means of amplifying the current, that is, a type of control valve. Suppose that a small electrical signal reaches the transistor in the radio receiver. This is what the receiver receives from the radio station. The transistor receiver has a battery that can provide more power. Due to the effect of the small signal it received, the transistor in the radio allows more electricity to pass from the battery to the speaker. The transistor converted the small amount of electricity (that it received) into a larger one. Thus, it allows listeners to hear a strong sound from the speakers of the radio receiver.
A transistor needs a small amount of electricity to function, i.e. a thousand times less than that required by a classic electric tube. Transistors can be very small, no bigger than a grain of rice.

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