Since the pressing stamper is made out of one of the nickel records that bears a negative impression of the grooves of the pressed record, it can't be played on a standard record player. But it can be played on one that is designed as the mirror-image of a standard player - a stamper player. It must revolve the platter counter-clockwise (as seen from above), and the tonearm must be able to rest the stylus on the "wrong" side of the record, with the cartridge having a mirror-image of the standard headshell offset. Also, the stylus must have a bifurcated tip so that it can straddle the elevated fill of the positive record groove. Such a stylus can be made from two, conical styli that are bonded together, after a "flat" is given to both, with an identical facet along the side of each cone. This was patented* by Pickering & Company from an invention by Fairchild engineer, George Alexandrovich, Sr.)
*Playback stylus for phonograph record stamper
A playback stylus for a phonograph record stamper and matrix is provided. The stylus comprises a pair of substantially cylindrical jeweled members each terminating at a tipped end. The members each have a flat surface defining a plane parallel to its longitudinal axis. The members are bonded to each other along the flat surfaces with the tip ends aligned to form a [double] "V." The ends of the members opposite the tip ends are bonded to a tube.
Inventors: Alexandrovich; George (Commack, NY)
Assignee: Pickering & Company, Inc. (Plainview, NY)
Appl. No.: 05/790,391
Filed: April 25, 1977