While I too question the need for such a cartridge warmer, there often seems to be some "warm-up" time for a cartridge suspension to reach its optimal compliance. This is most noticeable with brand new cartridges, but certain models seem to sound best (even after their initial break-in period) once a few sides are played. Different cartridge designs seem to be more sensitive to this effect than others, but I don't think it should be dismissed out of hand. YMMV would apply here.
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