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PCE
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DIFF Subgroup
H03G 9/20

in frequency-selective amplifiers

Introduced: September 1968

Full Title

Combinations of two or more types of control, e.g. gain control and tone control > in frequency-selective amplifiers

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

Child Classifications

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  • H03G 9/22 having discharge tubes IPC+CPC Available in IPC and CPC
  • H03G 9/24 having semiconductor devices IPC+CPC Available in IPC and CPC