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Hi
This is my first post on this forum. I am based in India.
I presently use an EMT 938 turntable with the 929 tonearm and the TSD 15 cartridge. Speakers are Rethm Saadhanas and amp is custom made by Lyrita Audio in India. Its a 2A3 amp using Dave Slagle's nickel output and interstage transformers and chokes. Also it uses Slagle's autoformer volume control. All cables are Acoustic System Reference Liveline cables.
Now coming to my question, i have been reading that the TT motor generates a lot of emi. and that absorbing it helps. Can i use Shakti On line stabliser for this purpose. Or would crystals help?
TIA.
Follow Ups:
Alan Maher Designs has created EMI chips just for purposes like this.Chips are postage stamp sized with adhesive backing.price is affordable (5 chips for $35)
Thanks dusted. Will give it a shot.
You might also consider installing an actual shield between your EMT motor assembly and the underside of your platter. Even using a copper platter mat may have some benefits. But do you perceive an actual problem that needs "fixing", or is this just audiophilia nervosa, from which we all suffer?
Because I did hear such a problem with my Kenwood L07D, I did install a shield made of "TI Shield", a commercial product that blocks both EMI and RFI. It works. Unfortunately for all of us, TI (Texas Instruments) stopped making TI shield. For EMI, mu metal would do.
I have searched the internet high and low for actual science that says quartz crystals per se can absorb EMI, and I have yet to find it. It seems to be a general gospel among audiophiles, however. I don't dismiss the possibility, but I would like to see the science.
Hi Lew
Thanks. No i do not hear any problem. No hum, nothing. I was wondering if having a magnetic shield around the motor would improve microdynamics.
Excess EMI will manifest itself in a constant background "grain".
AS Lew points out you will not realize it till you remove it.
That being said look at the magnetic field your cartridge has to work with. Small differences make for audible changes in fine detail and ambiance and in microdynamics.
Check out www.lessemf.com (no affiliation) for shielding materials. Ignore the mystical BS, but carefully read their application notes: quite useful and effective.
You might try it, nevertheless. I really did not perceive an issue with the L07D, until I actually installed the shield; blocking EMI raised the performance of the L07D by a noticeable amount, to my surprise. Depends on where the motor in an EMT idler is located, assuming 938 is an idler. DD's, like the L07D, and especially DD's with coreless motors built like that of the original Dual coreless motor (like the L07D), are especially susceptible to EMI from the motors, because of the orientation of the coils wrt the platter.
Thanks Lew. Will give it a shot. My EMT is a direct drive table.
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