Electrovibe 250k trim.

200k is fine. Fwiw, I keep plenty of 1M multi-turn trimmers on hand to use for stuff where it’s acting just as a variable resistor and not a mixer or divider— since it has multiple rotations, it can be used with enough precision to dial in anything requiring a trimmer between 150k and 1M. Of course, I use the ideal value whenever I can, but keeping the 1M multi-turns on hand is really useful for those situations where what you need isn’t what you have.
 
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