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Excessive woofer travel when playing vinyl

Is it the turntable,or is it the amp ???.. I would try connecting another turntable to your amp,and see if the symptom is still there.. If it is ,then I would suspect that the problem is in the amp... I would also take your turntable and connect it to another amp.. If the symptom persists there on a different amp, then I would suspect that the problem to be the turntable..
 
Currently it is my only turntable and amp. And to piss me off even more, I do not know anyone that has a turntable, or receiver with a phono input. My ipod works fine; but I somehow managed to delete all the music from it, and I do not have the laptop with my itunes(ex has it). FML
 
Gibsonian said:
I put a approx. 100# granite surface plate under my TT and it helped reduce feedback thru TT immensely. The large mass is hard to move.
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I did the same with some remnants from a local kitchen/bath marble place. Really makes a big difference in isolating the tables and looks very cool too.

Jblnut
 
One wonders what has changed if everything worked fine until recently.

There might be some AKers up there in Twin Cities land who could help you out with loaner components for troubleshooting.
 
Does the rumble appear by merely powering up the turntable & spinning the platter, or must the stylus be on the record?
Does the rate (you mentioned pulsing of about 4Hz) change with platter speed, or is it the same at both 33 and 45?






.
 
This question seems to come up every few weeks or so on one audio forum or another. So if you search for things like "woofer pumping," you should get a lot of threads that will give you a wide variety of opinions. Unfortunately, I'm not sure which ones you should believe. I'm inclined to think the problem is caused by a mismatch between arm and cartridge or a slight warp in the records or both.
-Bob
 
The pulsation only occurs with the stylus on the record. I took a very close look and it appears that the cartridge moves side to side when playing. Like a wobble. All of the records played are not warped.
 
Cartridge mount? Maybe the tonearm has some restriction in its movement? Might try stacking two lps on the platter. Seeing the problem at low volume pretty much rules out any feedback from the output, etc. I suspect. Got a head scratcher here.
 
"Like a wobble."

dstroyr-if you listed the tt/tonearm/cartridge combo you are using, i missed it. please reveal this, it could be something akin to the grado dance. if so, all need be done is to change the mass at the headshell. i had this same problem with a grado fte+1 (forerunner to the black) and i cured it by placing a one gram blob of modeling clay on the headshell, rebalance and reset the vtf and it was GONE.

my grace 707 arm was just too low in mass to have that cartridge mounted. the alteration of mass at the headshell quelled the resonance problem immediately.
 
hesson11 said:
This question seems to come up every few weeks or so on one audio forum or another. So if you search for things like "woofer pumping," you should get a lot of threads that will give you a wide variety of opinions. Unfortunately, I'm not sure which ones you should believe. I'm inclined to think the problem is caused by a mismatch between arm and cartridge
-Bob
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I had this problem and it was caused by a bad tone arm/cartridge compliance mismatch. Adding a bit of mass to the arm by wrapping some electrical tape around the arm (single layer wrapped along the arm from near the pivot to near the headshell-maybe 5" total) and rebalancing the tracking force almost totally eliminated it. I no longer have that table, but that's a really quick, cheap, easy, and easy to undo mod.
 
On the closeup of the headshell and cartridge in lifted state, there seems to be a lot of undue twitching. Looks like the platter is warped and certainly not running true in the video.
It might transfering from the platter through to the cartridge. Perhaps it's not shown up in your speakers until now because it's finally taken a toll on the cantilever suspension.
 
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remember that this is a philips 212 or 312, not a high end player. more precision and better performance will emanate from a more refined design.

its not to denigrate the philips but in the 312 i believe are nylon bearings in the arm. my friend made an open reel tape once for me and i could hear their effects. its how i knew he didnt use his then current sme 3009 arm. he went cheap on me.

try a kenwood kd500 and grace 707 arm, a great combination.
 
I thought I saw some up and down movement of the platter - that is a spring-suspension table, I believe. Make sure it sits on a level surface - a very cheap bubble level is useful for this. If you still have the problem after ensuring the table is level, you may need to tune the suspension springs. If you do have a cartridge/arm compliance mis-match, or a cartridge with cantilever suspension issues, then the mis-tuned turntable suspension (or non-level mounting) could well be exacerbating the problem.

EDIT: Both the 212 and 312 have sprung sub-chassis. Back to the basics...costs nothing (maybe $2 for a bubble level) to make darn sure your shelf and table platter are level, and is more important than most folks realize for a suspended sub-chassis table.
 
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Used a level and it is dead on. I placed the platter on a flat level surface and it is slightly warped; about 2mm. I think I may invest in a different turntable and quit chasing a ghost. So Dual 1019 or 1219?
 
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barkerd said:
... doesnt get talked about much but I believe many old school woofers had stiff compliance to combat this ....
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If I ever come across these, I promise that I will check auction prices and cautiously proceed to set them on fire.

The first decent subwoofer that I looked at oscillated from a CD source. I left the sellers house and thought that it may be the source material on the way home. Sure enough, the guy called back and that was it.

Nearly all of my modest attempts at vinyl have done this. I have one mint album that does not do this. Rod Elliot has an awesome collection of info:
http://sound.westhost.com/project99.htm
 
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