Or you could put a big variable resistor in parallel and gradually reduce it until you are happy with the result. Bearing in mind you don't want to go too low (too much current). The data sheet for the tube might tell you an acceptable multiplex current. If it doesn't, I would look at some data sheets for other tubes that do specify this and see if there is some kind of average current multiplier that is being used. Then drop it some and use that. The regular resistance formula will still give you the instantaneous current.
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