I made a side-thread for this since it isn't directly related: This discussion of "super semis" makes me wonder if anyone is still engaged in vacuum tube research these days. Could any of the basic t
I think only emissive materials that are more efficient at lower temperatures remain to be exhausted on this area. I do not think developing 30 kW of RF across 6 MHz (ATSC) can be developed with 30,
Hollow State devices (tubes) have a number of potential advantages over Solid State Devices. - Orders of magnitude greater electron mobility (they fly through vacuum better than through solids) - Mec
Field emission cathodes are very useful in very small electron devices. They can't be called vaccum tubes because they can operate at atmospheric pressures. The spacing between elements is small comp