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Creative and cheap DIY turntable/tonearm tweaks

Has anyone tried experimenting with a stock Rega tonearm to see what damping it by filling it with some spray foam insulation would do to the acoustics? How about sand filled? The more acoustically dead an arm is the better I would think. There doesn't seem to be much discussion on this forum about cheap DIY tweaks - just about spending more money on the latest hyped mega-bucks mod. It seems this crowd would be more inventive than that.
The Teres table intrigues me in terms of the DIY mod possibilities. How about filling the chambers with the lead shot with a damping fluid so the shot would "jiggle" and damp vibration more efficiently. Any thoughts?
128x128jyprez

Showing 2 responses by inpepinnovations1e75

inpepinnovations1e75
395 posts
 
TWL, upon rethinking my concern for horizontal resonance at the frequency of eccentricity, that shouldn't be a problem, as the frquency will be either about .5Hz or 1Hz and the mass would really have to be high for that to occur. Also, I should have mentioned that my cartridge is a BPS.
inpepinnovations1e75
395 posts
 
TWL, If there is a large horizontal oscillation, as happens if the cutting path spiral is eccentric, then the large horizontal mass, as you describe it, works against the stability of the cartridge stylus pressure and skating.
BTW, I think that the term with which you have been struggling to describe the principle of "horizontal" and "vertical" mass, is Polar Moment of Inertia in whatever plane that you want, horizontal & vertical.
I have no doubt that you did your homework on this and am contemplating making the same modes to my Rega 300 on the Alex IV. I do have some (2 or 3) quite eccentric LPs and it might be interesting to see if the increased horizontal polar moment will resonate with the frequency of the eccentricity.

Salut, Bob P.

salut, Bob P.
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