mix capacitors

mix audyn and jupiter capacitors in parallel, what results ? (preamplifier out)

Exactly which ones and which values??
Sorry... I forgot...
Jupiter Copper Foil Paper & Wax 1.0uF 600V and Audyn True Copper Max uF1.5 630V.

Um, that's kind of a weird mix!

So you are trying to end up with a single effective capacitor of 2.5uF ?

With those high quality caps if you absolutely must do something funky, bypass them with the same cap.

That is, if you go with Jupiter, use 1.0 and 1.5 of the same brand/model/voltage. It will cut the ESR and inductance in approximately half, while maintaining the rest of the qualities you were looking for.