Odd? Transmitter tubes for sale.

[KX4QC]

I stumbled on these tubes, but what are they? Do they have equivalents in US/Europe?
This one looks like it's built like a tank! $161.91

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https://www.aliexpress.us/item/3256803006921214.html

And then there are devils we know: about $26

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Only few ceramic transmitters on this website, maybe elsewhere.
Here's a big beggar:

FU-99F 4kW HF 221_23.png

And this reminds me of a familar transmitter, but I have no details of its care and feeding:

FU100F 218_75.png

Seems the move to solid state is cutting the price of tube tech.

It's been said that tubes are tough, but a transistor is always only one half-cycle away from destruction!

Maybe we should all buy a 811 / 572B linear while supplies last??…login to view the rest of this post