Turntable Bearings


How can we tell the condition of a used TT bearing with a good and reasonable accuracy other than just observing it?
manualblock

Showing 6 responses by manualblock

Thanks, maybe I should have been more specific. I'm looking to buy used, I have a 1980 version of a Linn LP12. The lower registers seem a little diffuse now and I'm told thats a symptom of a worn bearing. I can't see it but I can hear it.. So as clarification I'm not asking about obvious wear that's easily observed but instead I am concerned about a used purchase with undetectable wear by the eye. I would try an o-scope but I'm not exactly sure how to set that test up.I also use a stethoscope. I believe that after 40 yrs any bbearing must show wear even if it's unoticiable.
Also people ask for advice and I can't fully establish that a bbearing on an older table is good. Looking at an older Linn doesn't tell you much unless the wear is extensive.
I hhope that helps.
Thanks; still don't see how to check an older bearing though. BTW, Linn doesn't sell older replacement bearings; only the new ones for 1300$
The new Cirkus upgrade costs 1300 and no one will sell any NOS bearings. The issue is how to tell wear on any used 25 yr old table bearing and spindle. If you can see it; then it's too far gone to even consider as a purchase. So what thhen?
Yes; tried the stethoscope and seems o'kay. Consulted with two known expert Linn tech's and they seem to agree that thirty yr old bearing should be replaced regardless. No 1st gen Cirkus NOS available so the new Cirkus is the only option. Now to restate my question; does anyone recommend the purchase of a thirty year old TT with no way to conclusively determine thhe viability of the platter spindle and bearing? I would like to sell this table to a friend but not w/o being able to assure him of it's value. I know I could try for an NOS bbearing from Russ Andrews but I'm not sure it would fit in with my existing sub-chassis. I see a llot of older tables for sale and wonder if anyone really knows if the bearings are not worn into audible problems; even if you can't see the wear. BTW; thanks to all for the very informative and kind responses.
Microscope! That's the ticket. To address OCD;I agree to some extent; I know it appears a little overzealous to question the bbearing condition like this. But let me say this. I stated earlier that the bass sound seemed to be more diffuse and not quite as sharp and detailed as it was initially. How do I know? My only defense is I hhave owned the table for 30 yrs. I like to listen. If I felt I could not seriously tell these things then I would take up golf and buy a BOse system. But I trust my ears and this is my hobby and if you can't do that then whats the point? Please not to sound harsh it's just how I feel.
Thanks; The table was last serviced about three yrs ago but it sits on a shelf and doesn't move and I'm very carefull about it's use. As for the upgrade path; I wanted to install a Cirkus bearing last November but it seems I was a couple weeks too late and the 1st. gen Cirkus was discontinued and the new Cirkus was introduced. At significant price increase. I want to state that I don't question the quality and improvement in sound the new bearing would provide; I have heard one mounted on an older Linn like mine. I'm borrowing a binocular microscope from a friend. I'll keep this forum posted regarding my personal opinions and findings; FWTW.
I would like to establish here that this is fun for me; learning these things. And thanks for all the help from everyone.