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| Number | Title | Issue Date |
| 5113157 | High-frequency electron tube power oscillator A high-frequency electron tube power oscillator includes a multi-grid electron tube (1) in which the output power is adjusted by means of an adjustable impedance element (5) connected in series with the cathode line of the tetrode (1). In order to reduce ... | 05/12/1992 |
| 4012701 | Hartley oscillator A Hartley oscillator includes a basic Hartley oscillation circuit having a semiconductor active element, a tank circuit coupled to the active element and having a grounded end, a coupling capacitor connected between the other end of the tank circuit and a... | 03/15/1977 |
