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Those diode, tirode, tetrode, pentode, TWT, magnetron, klystron, dynatron, and so on... What are they doing now? Are they still in use, or gone into the oblivion? It's just my curiosity to know their fate. Can anyone there provide me any information about their present situation? Or any link to websites?
It appears that I have reached that time in life when the things that I know and love best have become relics of then"good old days"!
Thermionic devices are still in use. Tubes such as triodes, tetrodes and pentodes are useful where we need High Power. If you need to generate 10's of kWatts or megawatts for radio broadcast transmitters then thermionic devices are the way to go.
TWTs are still in use as broadband amplifiers used in satellite transponders, satellite earth stations and some radar applications.
Magnetrons, of course, are the power source in microwave ovens. They generate high powers with reasonable efficiency and can be pulsed to control the output power. Frequency stability is not a problem in ovens.
The klystron is in wide use a high power amplifier. It has uses in TV transmitters, and some radar transmitters. It's use in satellite earth stations has been replaced by TWTs.
I only recall ever seeing one piece of equipment that used a dynatron. They were a bit like a thermionic version of a tunnel diode. I am sure that they were very noisy devices by today's standards and I cannot imagine that they would be in use any more.
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Eligible for free shipping!