I have never seen any manufacturer publish s-parameters for tubes. And the
design techniques are different. The parts and methods used in biasing and
matching tubes are completely different than those used for FET's and
BJT's. The frequency ranges used for most commonly-available tubes do not
require s-parameters. There are very few tube amps around that operate
above 1296 MHz.
I see no reason to measure a tube on a VNA.
Zack W9SZ
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On Mon, Jan 16, 2023 at 8:29 PM Leif M <leif.michaelsson@...> wrote:
I read about first TV sets and their tubes, thats history. And began to
wonder if anyone has measured tubes with VNAs. Do you get meaningfull
results. Connecting something with 200V supply voltage to NanoVna must be
interesting.
