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RE: Linn LP12 Bouncing Eratically During Playback

Posted by John Elison (A) on August 23, 2016 at 17:03:53

In Reply to: RE: Linn LP12 Bouncing Eratically During Playback posted by Braxus on August 23, 2016 at 12:25:31:

It sounds to me like you have an arm/cartridge mismatch with the 17D3. If you have a reasonably flat test record with tracks for measure arm/cartridge resonance frequency you might check to see if it's too high or too low. Normally you want the arm/cartridge resonance frequency to be greater than 8-Hz but less than 13-Hz with 10-Hz being optimum. However, if it falls outside of that range, it is likely a major factor in causing the problem you are experiencing.

If the arm/cartridge resonance is too high you can add mass to the headshell to lower it. However, if it's too low you can't do much about it except to replace the cartridge with one having similar mass but lower compliance, which will raise the resonance frequency. In other words, your cartridge compliance is too high if the resonance frequency is too low.

Additionally, some cartridges have greater cantilever damping than others. I suspect the 17D3 might have very little cantilever damping. On the other hand, Grado cartridges often have a reputation for too little cantilever damping so I'm surprised you didn't have problems with your Grado. Perhaps its compliance and mass were a good match for your tonearm. Anyway, it sounds to me like you have an arm/cartridge mismatch with the 17D3.

I hope you figure out how to resolve your problem.

Good luck,
John Elison

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