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PCE
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CPC Subgroup
H03F 3/22

with tubes only (H03F3/24 takes precedence)

Full Title

Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > Power amplifiers, e.g. Class B amplifiers, Class C amplifiers (H03F3/26 - H03F3/30 take precedence) > with tubes only (H03F3/24 takes precedence)