I may have the possibility to buy a what seems to be defective Marshall branded Celestion G12 Vintage. Assuming the cone/coil unit might be the suspect of what the seller describes as scratchy or buzzing sound when hitting the strings harder: Would I just have a 444 cone reconed, or does that speaker need a somewhat special 444 cone (since they are said to be different from the standard Vintage 30)? Also, what I'm afraid of is, that the speaker basket has a mechanical damage (fell off somewhere e.g.), and thus the buzzing sound. Would that be typical for such a sound description?