DIFF Subgroup
H03F 3/52 with tubes only
Introduced: September 1968
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower > with tubes only
No child classifications to compare. This is a leaf node in both IPC and CPC.