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Can someone clear up my confusion over how to use the damping feature of my Jelco 750D, specifically the process of setting VTF. Do I set VTF first, and then add the silicone damping fluid, or add the fluid first and then set VTF? And, specific to the Jelco, which has a damping fluid reservoir with a screw on cap, how much should I tighten the cap (and what effect does the tightness have on the VTF)?
I'm running an AT150Mlx on the arm, which is mounted to my Empire 208 table. I've been running it without any damping fluid, but would like to try it damped to see what the effect is. I'm using 500K viscosity silicone fluid, and currently only have a small amount in the reservoir (I've read that you shouldn't fill is more than half full).
I'm new to this (obviously) since this is the first damped arm I've owned. I'd like to better understand (generally) the relationship between VTF and damping, and specifically how to best use this feature on the Jelco arm.
I appreciate the help!
Tom
Follow Ups:
The Jelco 750D appears to be a statically balanced arm in which case there should be no effect on the set VTF due to the damping as the force is constant.
Unless you are asking would the required VTF be different due to damping? In which case the answer is you may be able to reduce the required VTF (depending on the arm/cartridge match) since the VTF you required without damping may have included the component required to reduce the mistracking due to the LF resonance being around the warp frequency. When things are really mismatched you can see the cartridge jiggling up and down (and sideways) after a warp has been traversed. This reduces the effective tracking ability of the cartridge and puts a lot of stress on the suspension which also increases stylus wear.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
Set VTF. Then set VTA. Check / reset VFT. Damp LIGHTLY, by ear until slightly overcamped. Then remove a little with a q-tip or tissue.
There is no relationship between fluid damping and VTF for any of the tonearms I've owned including a Jelco SA-370H. In other words, fluid damping has no affect on VTF and vice versa. VTF is a function of the cartridge being used.My Jelco SA-370H came with a little vial of damping oil. I didn't use silicone fluid in it. However, both my SME III and SME V used silicone fluid, but I don't know the viscosity. I just used the SME silicone fluid that came with each tonearm.
Good luck,
John Elison
Edits: 10/26/14
it is truly disgusting :)
By denying scientific principles, one may maintain any paradox.
Galileo Galilei
used to be 100,000 cts
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Waaaaay out - as the manufacturer stated theirs was 500cps (quoted on VE; 2011)- obtainable as Ansmann "Dr Liquid" Silicon Shock Oil (50ML) - cheaper than Jelco!
Edits: 10/26/14
There was a long discussion about it on VEThe discrepancy between the two numbers is huge :)...
60,000 cst is like honey, 500 cps is like motor oil.
Edit...My dyslexia kicks in all the time it is Centi Stokes as in cst and cts....dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Edits: 10/26/14
Dammit - was going to remove the post as saw it/you referred to SME (2/3).
Anyways, 100,000 cps ("Dr Liquid", again) is still far too thick - though currently use it neat as it doesn't cause 'problems': the original SME part was specced @ 200,000 cps.
Having spoken to SME a few months back (not for those of a nervous disposition..) they apparently now don't recommend using damping at all..
Never set-up my Jelco 750D - had for over 3years - looks a 'dud purchase' in retrospect!
I had to double check it because i got the original info from DIY Audio, the second search confirmed the first info....so there you have it. John asked so i complied. You brought in doubt, now we are even, FWIW i have no info on the Jelco.
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Edits: 10/26/14 10/26/14
Hi Tom.....I will tell you of my experiences with a VPI 10.5i tonearm as to damping. I set the arm up the very best and carefully as I could. I added one drop to the damping well at a time.... The sound improved until at the next drop, the sound became muddy and certainly a step back. I removed that last bit of damping with a Q-tip...the cotton clipped off. Now I use a 3D tonearm which needs no damping at all.
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