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Steve,I think you may have confused my reference to my Dynavector 20X2 cartridge with the RCA Dynagroove recording process. Dynagroove was an attempt by RCA to equalize frequencies based on limitation of a spherical stylus. About the time it became popular, it also became obsolete, as elliptical styli became cheap and common. Now the Dynagroove is an abnormally equalized recording different(inferior) to its white dog and shaded dog predecessors.... not to be confused with Dynavector cartridges. Scott