Testing tubes cannot be done with the nanoVNA.
I have tested plenty of tubes, various types etc, using a tube tester designed to provide appropriate voltages to the correct pins to bias the tubes and measure emission.
Should you need to test tubes there are testers that can be found either complete or as kits to build.
Tim VK4TIM.
Sent from my Iphone.
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On 17 Jan 2023, at 12:29, Leif <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.
