alt Hacker Newsaccording to this video [0] the frequency was 84.2. that-s not unplausible.
a known problem in cutting vinyl records are sudden bursts of high volume frequencies around 100 hz, that have the potential to make the needle skip with a normal amount of weight on the tone-arm.
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I remember reading that the bassline in LFO’s self titled broke the cutting needle when they were pressing it. Wonder if that had a similar explanation.