[Texasrocker]

Could be the switches contacts points are old & worn out beyond cleaning repairs? Just a guess tho. Sometimes, vintage "all orig" parts must be replaced, even tho it takes away from originality of the set to keep the bandswitch operating into the future, or have a pro switch-rebuilder repair your orig switch. Yes,.. there are guys out there that offer these services! I usually just find a comparable switch & replace it from junk chassis' or spare-parts boxes when needed. Close visual-inspection of your orig bandswitch and continuity checks would be in order of the contacts-points.If replacement is necessary, its somtimes abit of a chore making the shafts fit the orig knobs on rotary-types, but abit of trial & error can get good results using shaft-couplers when acceptible, has worked for me. Just my .02