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In Reply to: Has the TD-125 been sitting awhile? posted by SquinkyEye on December 18, 2005 at 16:48:54:
Its actually a brand new belt, and I did a cleaning when I put the belt on, about a month ago. It could be feedback, I dont know that it isn't for sure, and it could be record defects, as its more intense with certain records than others. One in particular has quite warp to it.
Follow Ups:
Hummm, then perhaps it is a borderline cartridge/tonearm mismatch afterall. I haven't looked at the other posts or the math and don't know if you'd need to decrease tonearm mass or increase it. But you could easily find out and increase it by adding a small bit of bluetac on the arm or headshell, rebalancing, resetting VTF to maximum recommended, and trying those warped records again if you're so inclined. Hope this helps.
Hi, and thanks again for the help. I feel like I am being difficult to even say this, but based on the math I did, using the VdH sight, I found the match to be perfect. Incase I did things wrong, Tone arm effective mass was around 7 grams, cartrige mass was around 5.5 grams, that meant I needed a high compliance cartrige. Cartrige compliance was around 20 or 25 (Cant Remember), which put my resonant frequency in the 8-9hz range.Now, I suppose that things could be mismatching regardless, I dont know, I really dont fully understand all the interactions that are taking place. Though I feel I did a good job mounting it, using an alignment protractor, test lp, and scale for setup, it might not be setup correctly. I dont know if certain aspects of setup could effect that.
I have heard varying stories about my main tonearm. The main one I use is the ADC ALT-1. Its a low mass tonearm that I was told was fairly unpopular when it came out more from being overlooked than being a bad product. I have heard that it was one of the best values in its day, to it is still a great tonearm. I have also heard that it was an utter piece of crud not even worth messing with. I have considered putting a tonearm like the Rega, or getting a restored SME tonearm, but would hate to waste that money only to find that it didn't fix this problem, which I now think it wont.
If by "certain aspects of setup" you mean alignment then I'd say no; I doubt that could be the problem even if you hadn't used a protractor. But vertical tracking force can SLIGHTLY change the equation (try it at different settings and see - usually higher is better).Some would say that 8-9hz is not the ideal range and the common recommendation is actually 10-12hz. But under extreme circumstance, such as an interaction with your thorens suspension, an even higher resonance might give better performance.
As suggested, I'd try tweaking the mass of the arm with bluetac/putty/etc and rechecking the woofer movement levels.
And also as suggested by the other poster, the thorens springs may need replacing or modding with foam aswell.
Sorry I can't give you a definitive answer. You may have to experiment a bit. Perhaps others like John Elison will chime in and provide you with more understanding or a solution. Good luck.
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