A " class-A amplifier " is distinguished by the output stage devices being biased for class A operation.
3.
A disadvantage of Class A operation for power valves is a shortened life, because the valves are always fully " on " and dissipate maximum power all of the time.
4.
The triode is biased to Class A operation by applying a suitable negative bias voltage to its input control grid ( see diagram ), or by raising the cathode potential with biasing components.
5.
The first widely produced Princeton, the 1948 tweed-covered " TV front, " used one 6SL7 or 6SC7 dual-triode tube to provide two stages of RC-coupled voltage amplification in the preamplifier section; the power amplifier section used a single cathode-biased 6V6 beam power tetrode necessarily in Class A operation.
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