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In Reply to: RE: Linn LP12 Bouncing Eratically During Playback posted by Sondek on August 23, 2016 at 06:41:28
Guys. My 17D3 cart is brand new. Its had less then 5 hours play on it.
Follow Ups:
Okay! The suspension is not worn out, but that doesn't mean there's not a compliance mismatch. It appeared to me that the record warps were exciting the arm/cartridge resonance several times throughout your video. Therefore, it might be a good idea to try a different cartridge just to see if that eliminates the problem.
Good luck,
John Elison
The tonearm originally had a Grado Black on it with no issues.
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
Interesting since many people state they've used Dynavector carts on the Linn table and found them to be a good match. My arm is the Ittok 2.
You could very well be right, but it is so easy to check with a test record, why not rule it out.
Dave
Okay, I am officially out of ideas. It's not a failing Valhalla and not worn cart suspension. I have to admit I'm stumped.
I have a good friend that at one time was a Linn dealer and he's been my go-to guy for anything related to my LP12 for years now. I'll ring him up and direct him to your video and see if he's got any ideas. If he turns up anything I'll PM you.
Mike
Try another cartridge ? Even as only an Experiment.
That would at least narrow the error source possibilities
If the alternate cart doesn't do similar dancing.. then yer home free.
If not, then it's Forensics on the Arm time.
Try another cartridge ? Even as only an Experiment.
That would at least narrow the error source possibilities
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