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load resistance should be made double that suitable for one.
While the heavy power consumption of Class A amplifiers may
perhaps be tolerable in amplifiers worked from the mains, and at
least has the merit of being constant, it is quite intolerable when
batteries are used, their cost per unit being enormously greater. The
particularly undesirable feature is the continuance of full power
consumption during quiet periods, so that the average efficiency is
very low indeed.
19.11 Class  Amplification
The inadequate power output indicated when the transistor curves in
Fig. 19.7 are examined on a Class A basis prompts us to look into
other method ...