Class H03F : AMPLIFIERS
Subclass 1/33: Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F 1/34) in discharge-tube amplifiers
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11062871 | Analog amplification vacuum tube | Jan 10, 19 | Jul 13, 21 | Noritake Co. Limited; Noritake Itron Corporation; |
| 10216205 | Low voltage tube circuits | May 20, 16 | Feb 26, 19 | Not available |
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