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PCE
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DIFF Subgroup
H03F 3/36

with tubes only

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > DC amplifiers in which all stages are DC-coupled > with tubes only

CPC:

Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence) > with tubes only

No child classifications to compare. This is a leaf node in both IPC and CPC.