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Voltage regulator tubes vs zeners (tubes has BETTER stability)

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T3sl4co1l:
VR tubes are not good choice, it oscillate!

Depends on what's connected to it, and in the case of the TL431, how it's connected too.  Which circuit did you follow?

Tim

Zero999:

--- Quote from: 001 on December 21, 2019, 04:08:56 pm ---In fakt TL431 is not good choise for HV circuit
it oscillate  :horse:

--- End quote ---
Was it connected in the cascode configuration I suggested above?

I fount it was stable, but larger, slower transistors can cause additional phase shift and oscillation. Try adding an emitter resistor.

https://www.eevblog.com/forum/projects/tl431-common-base-amplifier-stability/msg606605/#msg606605

iMo:

--- Quote ---LM723 has a buried zener reference so it's nice and quiet.
--- End quote ---
Nope, no burried zener there. And pretty noisy.

iMo:
Here is the Zero999's cascode with "most accurate ED TL431 model".

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