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| Number | Title | Issue Date |
| 7286060 | Indicators for vacuum tube replacement devices A vacuum tube replacement device includes an indicator. The indicator can be arranged to provide audible and/or visual indication of system performance, function, status, or any other desired indication. The vacuum tube replacement device is pin-for-pin compatible w... | 10/23/2007 |
| 6097246 | Current limiting breaking device using electromagnetic repulsion coil The present invention includes a first switch 4a, a second switch 4b and a capacitor 4d. The first switch 4a normally in a closed state is connected in series between a power source 1 and load, and opens when an accident builds up. The second switch 4b no... | 08/01/2000 |
| 5648664 | BIFET vacuum tube replacement structure A BIFET vacuum tube replacement structure includes a plurality of devices that replicate the characteristics of a vacuum tube. The vacuum tube replacement structure has the same pin-out as the vacuum tube being replaced and so can be exchanged directly fo... | 07/15/1997 |
| 5434536 | Semiconductor emulation of vacuum tubes A semiconductor emulation of a vacuum tube with one or more of the following characteristics: non-linear output, non-linear transfer, non-linear input, reverse transfer, and second harmonic generation. Also an emulator with a second output to emulate a ph... | 07/18/1995 |
| 5206565 | High-power low-voltage tetrode having a full walled matrix cathode and a control grid spacing of less than 1 mm In a controllable high-power electron tube in the form of a tetrode, the anode direct voltage is reduced to less than 10 kV with an anode efficiency of greater than 80%. The tube includes coaxially arranged electrodes including a cylindrical indirectly he... | 04/27/1993 |
