I guess an acetate is a raw trial of a disc or CD to check for quality but I haven't a clue what a "stamper" is! Maybe someone could enlighten me? In ther meantime a big thanks go to members of the list who have helped me fill the gaps in my KLF collection with good quality copies of Lost Sounds Vol 2 and The White Room rather than dodgy fuzzy ebay copies! You know who you are and I thank you again...but I still don't know what a "stamper" is!