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In Reply to: RE: Linn LP12 Bouncing Eratically During Playback posted by Braxus on August 21, 2016 at 18:18:44
Just had my PS redone, purchased a new cart, still breaking in.
Are you sure you haven't repositioned table to allow up and down physical motion? The table sounds like it's moving so that the spring loaded suspension is moving.
My table is very old although in good shape and with pretty good aesthetics. It started very slow, then did not keep speed. I had it repaired 2 yrs ago. Recently, it would start, just dead. My expert advice and repair brought me a table which starts kind of slow and has some mild buzzing. Maybe your PS is gone, starting and slowing.
Follow Ups:
I was having the same kind of thought. The power supply, although I don't think the OP told us which one he has, could be causing the motor to jerk on the belt, and that jerking could manifest via the suspension. The old Valhalla supplies are quite old by now and I've read plenty of stories about guys with dead Valhalla power supplies looking to get them fixed. I had an issue with mine years ago before I got my Lingo.
https://youtu.be/sx_SZ2XNq_o
See the above video. Stereo is on a wooden custom rack 4 or so feet tall. Near the wall. Power supply is the Mose. Cart is the 17D3. I never had issues with a Thorens 147 on this rack. Same type of suspension.
After watching the video I agree with Mr. Elison. The Ittok and Ekos both generally are happier with carts in the 9gm range, however, the 5.5gm of the 17D3 is within the happy-range of both. I think John may well be onto it with his suggestion of deteriorated cart suspension.
Guys. My 17D3 cart is brand new. Its had less then 5 hours play on it.
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
that's the first thing I'd do before anything. It looks to be like the motor is passing on too much vibration to the table. Your deck definitely need adjusting/tweaking.
Also, do you have another cartridge you can try on? It's possible that cart's suspension is going.
to happen. It starts to wiggle just after the warp and then starts to stop but then again that warp comes around and it starts again.
This is why I asked the OP if it happened on warped record only or on almost perfect records too.
Can anything be done to help that? Most records have some warp to it to some degree and I cannot play them like this.
I agree with Cougar that the problem is initiated by the warped record. The platter appears to be spinning with good stability. However, the arm/cartridge resonance is becoming excited by the record warps, which indicates the resonance frequency is too low. This can be resolved only by installing a different cartridge with lower compliance in order to raise the arm/cartridge resonance frequency. Silicone fluid tonearm damping would also help the situation.
I wonder if your 17D3's cantilever suspension is wearing out and becoming more compliant, which would lower the arm/cartridge resonance frequency. At any rate, the platter seems to be spinning smoothly while the warped LP is causing the tonearm to bounce and excite the arm/cartridge resonance. I have a feeling the cantilever suspension on your 17D3 might be wearing out and becoming more compliant.
Good luck,
John Elison
Some use record flatteners to reduce them. Not all warps are like that one in the video.
I'm just interested if it's happen with flat records too.
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