The CSP2 and CSP2+ come stock with G.E. Film caps of either 0.33uf or 0.68uf. This defines the acceptable range of values that can be used. The reason Jupiter Beeswax and or the VCAPS are not an option now, is because of their physical size relative to the stock caps. Proper installation of either of these caps would require alterations to the internal layout if you ever plan to ship the preamp anywhere. The new CSP3 that's just around the corner will have the Jupiter Beeswax caps as an option because I will be completely changing both the internal and external layout of the preamp. The value we will be using for this option is 0.47uf.