kodera2t
I got a mysterious item from Ukraine. It looks like subminiature tube but rather it is VFD.
The name of it is IV-15 and it seems it is compatible with DM-160. The data sheet says,
just a few months ago, this symbol was mysterious symbol but now I can understand. It is direct-heated TRIODE. Indeed I can find several people who realized amplifier by this VFD, and it seems not difficult. I will measure its frequency response and check if "VFD radio" is feasible or not. (As for Nutube, its transition frequency is less than 1MHz and impossible to make radio (except for LW radio))....
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Ahh, it can be used to display a voltage as the brightness of a lit segment.
http://www.radicalvalves.com/all-types/vfd/
There is a cute video here:
https://tubes-store.com/product_info.php?products_id=673
It's not clear how much gain you can get from it as an amplifier since its purpose is to turn the flow of elections into light .
Are you sure? yes | no