Hi there; I was reading the AR-2X modification write-up done by, Sam Payne, in the AR library, under AR original classic models '54 - '74. He removed the original Sprague 20uf 50 NP elect cap and used a Solen 10uf polyp cap in its place. Did that change the crossover point? What would have happened if a 20uf Solen polyp cap was used? Why might he have gone to such a drasticly different size? Is that required when going from elect NP caps to Polyp caps? Obviously there is more here than meets th