[codefox1]

If you are replacing all the old paper capacitors in a simple old set, makes some sense to replace all the carbon resistors at the same time seeing as you have cleared off the terminals and so on. A fist full of resistors is only a couple of dollars, and as already stated, best fix up a set once. Carbon resistors generally drift up in value, but also develop "noise," and become heat sensitive as they age. De-soldering can, as mentioned, make them less stable. Your choice!