Hi there,unless you have some experiance re-winding motors or transformers,I'd say you should pass on repairing it yourself.Look for another head,(blown up,or in worse shape than the 880),for a similar trans.I think the one in the Collisum lead and bass is the same as the 880,(correct me if I'm wrong).Or try a reputable motor re-wind shop,they might be of some help.There are some shops that specialize in vintage transformer re-winds,hope this helps,good luck Mel.