Tetrode Tubes
What is present situation in the field of electronics about the vacuum tubes of good old days?
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 It's use in satellite earth stations has been replaced by TWTs.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.
Check out these deals on Tetrode Tubes-related items and save!
 GU-33B GU33B 33 b Power Tetrode Tube (own box). NOS/NIB US $29.99 
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 6E6P-E Russian Audiophile Tetrode tubes. 8 pcs. NOS/NIB US $24.00
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 6E6P-DR Russian Audiophile Tetrode tubes. 8 pcs NOS/NIB US $48.00
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 GU-34B GU34B 34 b Power Tetrode Tube (own box). NOS/NIB US $29.99
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 6P21S beam tetrode tubes. Lot of 2. NOS/NIB! US $49.00
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 6P41S output beam tetrode tubes. Lot of 2. NOS/NIB! US $9.00
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 6P41S output beam tetrode tubes. Lot of 4. NOS/NIB! US $16.00
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 6R3S-1 double tetrode tubes. Lot of 2. NOS! US $19.00
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 GS-23B / GS23B / 4CX1600U 1.5kW tetrode tube. NOS/NIB! US $149.99
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 6E5P Russian Audiophile Tetrode tubes. 8 pcs. NOS US $16.00
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Svetlana 6P45S 6P45C EL509 6KG6 Tetrode Tube
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