For a large number f applications, the amplification produced by a single triode is not sufficient.
In order to overcome this difficulty,several amplification stages may be coupled or connected by feeding the output from the plate circuit of one tube into the grid of a second tube.
To make a cascade amplifier,two or more tubes are coupled by means of resistors,transformers or other components.
A cascade amplifier is any two-port network constructed from a series of amplifiers, where each amplifier sends its output to the input of the next amplifier in a daisy chain.
The complication in calculating the gain of cascaded stages is the non-ideal coupling between stages due to loading.
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