Nasty cosmetic mark on the casing. Looks as though it had some sort of tape stuck to it and whatever normal cleaning chemical, does not shift the patches of discoloration of the anodised? silver-grey matt finish. I don't think the underlying metal is aluminium or brass, maybe stainless steel, certainly stained now. I tried light brushing with a bronze wire brush in a Dremmel on a small part and seems to have reduced the effect but still there, any ideas of cause , materials and any cure? While at it is B,M,S on the filter switch , German for Bass,Middle Treble, - Bass , Mitte,Sopran ?
- posted
13 years ago