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I looked at the Grado database on vinylengine, they only list one Grado with my TT, a Thorens TD-150. It says it does hum.
My question is, is this actually the TT, or the arm? I plan on replacing the stock arm with an Origin Live Silver I got used off audiogon. I am intrigued by the possibility of using a Grado Statement series (probably Sonata) as it looks like the manufacturer of my preamp, Parasound, had Grado Statement series in mind when they voiced the "MC" input. They mention Grado Statement several times in their literature.
Follow Ups:
On my old Rega Planar 2, my Grado hummed more as the cart approached the inner grooves (and the TT motor). I solved it by placing a piece of Mu-metal on the surface of the plinth, under the platter, near the spindle, and in line with the stylus tracking curve. The other suggestions regarding shielding and grounding would also be worth a try.
Mike
I have a Grado Gold I use sometimes on my TD 145 and yes it does hum faintly - not enough to bother me really.
-I've done that on several machines that were notorious for hum with the Grados and it took care of it.
I see my friend's motor has four wires coming out of it.
Orange, yellow, white and blue
Which is ground wire?
Where should I attach it to?
g
On a Rega, you can solder a ground wire to the motor chassis, run it to the bearing sleeve,
solder it there, then solder a second ground wire to the bearing sleeve and run it to the ground wire thumb screw on the phono preamp or preamp. This is the traditional solution for eliminating hum on Rega/Grado combo's and is usually effective.
There's plenty in the archives about this, but to cut to the chase.......
You can get rid of the hum by using mu metal. I wrapped my SAMA with mu metal and also placed a round sheet on the plinth under the platter. Eliminated the hum I was getting with my Master on a VPI tt.
I've owned several Grados over the years, both plastic and wood body. Subjection to hum is table dependent. Those with AC motors located under the platter seem to be most likely. There the cartridge comes in close proximity to the motor as it tracks the record.
But does anyone believe Grado could have survived successfully for so long if their cartridges hummed in every set up?
But yes, note Rick's comments on mu metal shielding.
"You can't know what the "best" is unless you have heard everything, and keep in mind that given individual tastes, there really isn't any such thing." HP
I called Music Hall and before I even asked my question about a simple belt the man told me to stay away from grado carts "you are getting it from the hoares mouth it will humm dont use it" and went on to how it was constructed very adament about the cart like one> he had heard the question so many times and 2> He was involved in designing Music Hall tables. Just my recent experience for what it is worth, it told me a lot.
my understanding is that grados are unshielded and vulnerable to hum.
Tom Collins
Ferrous platters are notorious for making Grados hummmmm.
Opus 33 1/3
Don't you think there should be an answer to this old ? someone should know why ... aren't they iron core or in some way different than most other carts in materials ... duh clue? ok so I'm saying hypothesis : ferromagnetic jitter ;)
I believe there was something unique with the way the cantilever attaches to the body, and this in turn effects compliance. I have a VPI with the 3D arm and was warned to stay away from Grado, apparently that combination doesn't work well.
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