Other Modifications (not recommended by Doc B).Bottlehead Speedball – Camille Cascode Constant Current Source (C4S).Just try to keep it sane ).”īasic modifications can be broken down into a few categories: There’s lots of great $15 caps and $30 pots out there that can improve the resolution, and tube rolling can be a lot of fun too. “don’t get me wrong, I love that folks mod our kits! Appropriately priced parts can be great fun.