You are overlooking things like magnetrons, x-ray tubes, photomultipliers, CRTs (which still have a lot of applications outside of the video display sphere), kr

You are overlooking things like magnetrons, x-ray tubes, photomultipliers, CRTs (which still have a lot of applications outside of the video display sphere), krytons and so forth. It's not all about diodes, triodes, tetrodes and pentodes.