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Well, no ear-shattering advancement is evident, but it looks pretty and this simple little Sony/ADC rig sounds darn fine. I have under $100 bux in the stone base project. It will take some time to hear if its a sonic improvement; it should be subtle... I'm still waiting on the deliver of the aluminum plate for the constrained-layer damping on the underside.
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I went from something like that to 2" hard maple on top of a home made MDF TT Stand.
I got 6 solid 3" rubber balls and cut them in half. I used that between the marble and MDF and now the Maple and MDF. Each update made improvements. The only thing I didn't like about the marble is it Ringed if I tapped it with my nail.
I think it sounds a little more "focused" -the image is a little more clear and stable (but something as subtle as that could be "placebo effect"). That's aided by the background seeming a little quieter on real clean records. (That effect is usually swamped by the surface noise and garbage cut in the grooves.) I feel there's no noticeable difference in the bass.If you're considering a project like this, I would suggest that you get more marginal benefit from levelling the table, tightening the cartridge screws, cleaning the headshell connections, checking the azimuth, and adjusting the VTF (cost about 20 cents for Caig Gold).
Well, it's pretty anyway and has some good engineering / technical BS to go with it. It's more like the improvement in drag coefficient you get from waxing your car- it's there - negligible but it looks good.
Edits: 05/01/16
nt
I like your summation. Sorry it didn't meet your lofty goals but I'll bet it adds more than eye candy.
Sometimes making things heavier helps with resonance control and sometimes it does not, although experimentation is key because tuning by ear is still the best way.
I am speculating that floor is weak link in tt setup. In my expriments, o more mass alsays helped. Also in my experiments, Suspension ddi not usually work soo wellm. In my experiments..I found hard wood the best but it adds inches of dimensions.
I have a 1500 lb stand (.hardwood plywood sand)..built in place qnd now qlmost part of house. Think it helps. But Never really compared it with tt sitting on floor..but might do that soon.
try putting stuff in between like, thin layers of styrofoam, or cardboard, or rubber, or vinyl flooring, cork whatever, see what makes a difference and if you like it.
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
The lower piece is just an isolated little closure panel, so you don't look at the damping feet underneath the upper plate. It is not connected to the plate.
The plan is to add a constrained-layer damper of an aluminum plate bonded to the underside of the stone through a visco-elastic film. I'm waiting on the aluminum plate from a friend.
If anybody's interested, you can alculate the plate thickness and stuff from formulas in the Navy scientific papers. The Navy use this approach to quiet the walls of submarines. Vibration of the stone plate is dissipated by the viscoelastic, but it needs to be sandwiched with a constraining layer having around 1/10 the elastic stiffness of the plate you want to damp.
The plate now sits on specific anti-vibration feet similar to the Mapleshade Isoblocks that I purchased from Wagner Motion Control. If they don't work well there's cool alternatives from the link below. Just FYI.
Are you saying that there is only one large piece of marble in the picture above?
I see two pieces of marble the same size stacked one on top of the other with a gap in between the two. I even see a shadow made by the top one on the top of the bottom one (left side).
What is fooling me in this image?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Sorry dude! The piece you labelled "2" is just a tiny strip. It is unconnected to the top slab.
on a home made stand as a base for my TT.I placed a sheet of cork between the two slabs of marble.
There are adjustable spikes that reach through the carpet to the concrete floor at the bottom of the stand and adjustable spikes at the top of the stand into the bottom of the bottom slab of marble.
BTW, the Wheatstone Bridge sitting at the bottom of the TT stand was made by Queen & Co. between 1893 and 1912. It's in beautiful condition.
James W. Queen & Company until 1893 and Queen & Company until 1912 when they became the Queen-Gray Company.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 05/01/16
The Wheatstone Bridge is very cool.
I use mouse pads layered between two maple butcher blocks.
I have had good results using several Herbie's Grungbuster Dots, between layers of stone and between stone and hardwood.
It still senses what is under it feet, not as much as other tables, but you can hear differences. Experimenting with stuffing the layers will cost ya almost nothing.
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
I bought that turntable new in and around 1980. It replaced my Pioneer pl512. At the,time it was a big improvement. I ran it with a Technicraft cartridge and,then an AKG. I really enjoyed it. It is well made, however the weakness is in its arm. It is virtually immune to feedback. Rock solid base.
Edits: 04/29/16
1980, eh? I have to apply my motto; "It's never too late for a happy childhood!" I think my days of dealing with component tonearms are behind me. I've only had massive arms with widely-spaced gimbal bearings in the past, those best suited for mounting solidly on the deck of a big DD table and handling low-compliance low-output MC's.
I think the Sony arm is pretty good, actually, but only for super-high compliance cartridges. It likes the ADC XLM-II I have now and the XLM likes it too- good match. It is in the same effective-mass class as the Infinity Black Widow or Grace G707, just not as beautifully made; overall it's construction seems decent though. It is very similar to the arms on the upper-line Sony biotracer TT's of that era, just straight and very lightweight. It was a slight craze in the early 80's...
The A-T Technicraft carts were similar to the A-T 12 line of the day IIRC, medium compliance say 15-20CU - probably at the upper bound of those very light arms to handle. I'm not too familiar with the AKG's, probably around the same compliance range tho'. Some arms and some carts are kinda finicky about the tuning arising from cart compliance/effective mass, some less so. I've found mismatches in this department can show up problems in the system, especially if your system has extended bass capability.
This is new turf for me, but it's working pretty well, so far.
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
To paraphrase a meme.
I don't know if it will result in a sonic improvement, but for under $100 it sure looks very nice. I would do it.
nt
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