DIFFERENCE BETWEEN TRANSISTOR AMPLIFIERS AND TUBE AMPLIFIERS

DIFFERENCE BETWEEN TRANSISTOR AMPLIFIERS AND TUBE AMPLIFIERS

Although both transistors and grid-controlled tubes (e.g. triode, tetrode and pentode) can render the job of amplification, they differ in the following respects:

1. The electron tube is a voltage-driven device while the transistor is a current-operated device.
2. The input and output impedances of the electron tubes are generally quite large. On the other hand, the input and output impedances of transistors are relatively small.
3. Voltages for transistor amplifiers are much smaller than those of tube amplifiers.
4. The resistances of the components of a transistor amplifier are generally smaller than the resistances of the corresponding components of the tube amplifier.
5. The capacitances of the components of a transistor amplifier are usually larger than the corresponding components of the tube amplifier.

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