Stampers? Are you sure that you don't mean " mother discs"? A stamper should be the complete negative to a record pressing, and as such could only be played in reverse rotation with a special stylus that would actually ride on the groove "peak".. The cartridge manufacturer Stanton used to make a stylus just for that purpose... To repair slightly worn stampers so the record pressing plant could get more pressings from a particular stamper.
So many questions, so few answers Member since Nov 2010 876 Points Moderator
Stand corrected, mine is a positive and thought it was called a stamper. Makes sense the negative being the one that actually stamps the vinyl.
Out of curiosity does the positive "mother discs" create the negative in the same way? or does the "mother discs" stamp a negative mould to create the stamper.
The 'normal' sequence, put simply, is lacquer disk, which is cut to produce a master, the master disk is plated to create a 'father' (negative image), which is plated to create a matrix (positive), which is plated to create a stamper (negative), two of which are used in a record press to stamp multiple copies.
Direct metal mastering (DMM) eliminates two of these stages.
I remember certain recordings being touted as "direct to disc", and something that was new at the time. Obviously people had forgotten that all music was recorded direct to disc before the advent of recording on tape...