Some awesome valves (tubes)

[ppppenguin]

https://spectrum.ieee.org/the-11-greates...r-heard-of

[Mike Watterson]

Odd it doesn't seem to mention, unless I missed it, that Magnetrons are used in microwave ovens and all the electronics could be replaced with clockwork. Also TWTs were used in Satellites inc Satellite TV.

It says Klystrons are more powerful than Magnetrons, but historically Klystrons were lower power. A Magnetron inherently pulses which is fine for Radar and doesn't matter for an oven (in an oven the power setting doesn't change the power at all, just varies on and off time). A Klystron is usually a continuous wave device, as is the TWT. BBC terrestrial microwave links still used TWTs in the 1970s. The modest output power is as important as the gain, feeding the dish via a waveguide and small horn.

Lots of people won't have heard of decatrons or nuvistors or the more specialised CRTs. Apart from the Condenser Microphone amp the list seemed to concentrate purely on high power military & medical applications.

[peter scott]

The VF14 is an odd one to include in that list!

Peter

[BusyBee]

Yes, I noticed that there are mainly high power / frequency types but it is interesting.

I suppose, when talking about beam tubes there are quite a few entries we could add, including the Russian rod tubes we know well. It wouldn't take a lot of doing to produce an article of more 'down to earth' in terms of more mass market / consumer / low power and size / availability /cost. The list of VHF / UHF valves would be a good start although many of them may be known but, I suspect, seldom seen.

Tracy

[Mike Watterson]

The VF14 is an odd one to include in that list!

Peter 

Yes. There are plenty of lesser known types.

Jeffery's title is more apt than the IEEE title!