That certainly worth a shot.
Btw, what value of trimpot should I go for? 1k? And, do I want to bypass the TL431+trimpot with a small film cap?
Sorry, I have never used a regulator.
The small 10 to 25 turn trimpots have a power rating of 50 milliwatts typically. I don't know your 6H30 bias voltage but if it's 3 or 4 volts then 1K would give you 9-16 milliwatts. 2K or 5K depending on your target voltage would be better IMO to reduce the power dissipation to < 10 mW. You can also use a pair of fixed resistors if you don't need adjustability.
... do I want to bypass the TL431+trimpot with a small film cap?
In my experience these cause no stability problem even with high gm tubes and they have plenty Gain*BandWidth for this use.
If there is oscillation in the 200KHz-2MHz region (the GBW limited region), one could certainly try bypassing between a and k pins as a solution.
My personal bias is to only add components when there is a specific need or significant performance enhancement.
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