The main problem with fluid damping is that the 'paddles' used are too often of the wrong shape. One of the few arms (when equipped with damping facilities) which got it 'righter' than others was the Bruaer (spg!) The paddle was designed to give more damping in the horizontal plane than in the vertical plane....and it worked well.
(But generally fluid damping is reserved for unipivot and twin pivot arms). The exceptions are few.
OK. Thats is new to me. Is it due to which vibrations we are targeting with regards to axis of the tonearm tube ?
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Don't know how the stress is simulated in the ortofon arm tube as shown here.
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I have tried my attempt at damping. Don't know if they are any worth exploring.
Example 1 and Example 2
Regards.
These are interesting concepts. Link. You can right click and select translate to English. Don't know the first concept where tonearm is coulpled with wing shaped gadget with weights on extreme ends. Also if someone wants to see Tonearm vibrations at low frequency levels. Link. (Please turn down the volume.)
Regards.
Regards.
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Looking at the 'cartridge equaliser' I am reminded of the banned mass damping system used in F1 back in 2005/2006 Mass Damper
Certainly if you chose your metals right it should help, but not sure where the loss is, unless they are relying on the spring to damp a bit as well.
But assuming Shure was right and the brush is the best system (not convinced yet on that as it seems to be unadjustable and only really look on vertical modes) could a retrofit DIY unit be made easily enough?
Certainly if you chose your metals right it should help, but not sure where the loss is, unless they are relying on the spring to damp a bit as well.
But assuming Shure was right and the brush is the best system (not convinced yet on that as it seems to be unadjustable and only really look on vertical modes) could a retrofit DIY unit be made easily enough?
Hi Bill. I just noticed this thread. Thanks for starting it
Today I had a look on modulation formulae, as I was intrigued by Lucky questioning the existence of AM
I would say now that it is double sideband AM plus some IM. Most probably no much of FM (flame me)
I’ll work it a bit and I’ll come back.
http://www.diyaudio.com/forums/anal...ifying-dl-103-nov-2009-story.html#post2566504
I’ll dig out for you some Shure M97 test disk recordings with /without the stabilizing brush
George
Today I had a look on modulation formulae, as I was intrigued by Lucky questioning the existence of AM
I would say now that it is double sideband AM plus some IM. Most probably no much of FM (flame me)
I’ll work it a bit and I’ll come back.
http://www.diyaudio.com/forums/anal...ifying-dl-103-nov-2009-story.html#post2566504
Now that you mention it, masters of tuned mass damping were some Dual arms.
I’ll dig out for you some Shure M97 test disk recordings with /without the stabilizing brush
George
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You're welcome
I haven't had a chance to get that far but decided that for our purposes the result would probably look the same and the focus should be on killing the source of the modulation if at all possible.
Blimey. That's a little more extreme than I was thinking, but a useful data point. I do have some MM carts that could be sacrificed for testing.
Cool. would be a good reference point.
That's an interesting idea!
Recently a friend told me to stuff my speakers with bubble wrap instead of the usual foam fillers. He recommended the soft and small bubble type instead of the big bubble type which are quite hard. I haven't got down to trying it.
On another note, doesn't the Longhorn mod qualify as damping? My understanding is it dampens the unwanted vibration of the cartridge body, and is especially effective for plastic bodied cartridges. The extended "horn" also seems to have a stabilising effect in the horizontal direction. I'm happily using it on both my DIYed arms (running a Denon DL 103 and DL 160). The Longhorn has helped to improve the solidity and focus of the sound. Sorry if that description sounds a bit vague, but I'm trying to say that it has improved the sound, substantially, in both.
Would you, by any chance, recall the grade of the silicone oil?
I want to try a drop of silicone oil on the bearing of my Nanook 219 arm (unipivot, Parker ball pen refill tip used as male bearing, brass plate with conical indentation a wee bit larger than the tip of the refill used as female bearing). I'm unsure if the 500000 grade silicone oil I have would be too thick, plus if it would end up being a dust magnet.
Having had to google the longhorn mod not sure that would do much other than add mass. If you look here Further on ridiculously Low Cost cartridges. - Page 4 - Vinyl Engine 3rd post down they have what they call the Dumbell, which could be a cartridge mounted mass damper if the right materials were chosen. However I view it as more focused on warp issues and most of us are lucky enough not to have too many warped records.
Attached pic courtesy of audiocircle is the most heroic budget damping solution I have yet seen!
Attached pic courtesy of audiocircle is the most heroic budget damping solution I have yet seen!
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Hello sir,
I see there are some screws adjustment in counterweights. How are they tuned ? Do they work by tightening screws which presses mechanical damper more to the tonearm tube end ?
Thanks and regards.
Had a look at the cartridgeman patent for his isolator The Cartridge Man Isolator . Sadly it just says 'foam between plates for magic flooby'.
For this to work it needs to be a foam or gloop that damps below 20Hz and looks solid above that. Any ideas what would fit the bill?
For this to work it needs to be a foam or gloop that damps below 20Hz and looks solid above that. Any ideas what would fit the bill?
Some FFTs from 2007 16bit/44100kHz recordings of 'Carmina Burana', 1st track ('O Fortuna')
Vinyl rip is
Cartridge: SHURE M97xE (stock)
Arm: SME 3009 Improved (modified)
Turntable: THORENS TD 160 B MkII (modified)
Mat: original TD160 mat
RIAA PreAmplifier: Hagerman Bugle with batteries
Tracking force setting: 1.5g when brush raised, 2.0g when brush lowered
1st set of FFTs:
Frequency range 0Hz-22kHz
FFT Size: 65536 samples (0.67Hz resolution)
Zero padding: None
FFT overlap: 75%
FFT window: Kaiser beta 15
George
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