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How to eliminate TT feedback/vibration

1st Thing I will tell you - I have an OLD TT. It's a Pioneer PL-71. ( I'm looking at a Clearaudio CMB ) My TT is placed out in front and to the left of my left speaker(per Jim Smith's book.) I made a platform of MDF attached to the wall where my TT sits. At no point does the platform contact the floor. When I play certain albums-several in fact, at mid to high db levels, I get either an acoustical feedback or vibration feedback from low hz. I have tried to isolate my TT using something like sorbuthane balls and foam. I have not tried any of the commercial cone devices advertised. (Do they really work and if so-what's the best product?-no salesmen please). I don't know if my problem lies with my TT, or my platform it's sitting on. I have a friend who actually hung his TT from the ceiling years ago, and I may have to do the same. Thought I would inquire if anyone knew the answer before I started experimenting. Will a higher end TT like the Clearaudio cure my problem? Is it the platform I made-or do I simply need some isolation cones?
handymann
auxetophone
114 posts
 
Here are various Sorbothane devices. One of them may work for you:

http://www.amazon.com/s/ref=bl_sr_hi?_encoding=UTF8&node=228013&field-brandtextbin=Isolate%20It%21
moonglum
619 posts
 
11-22-10: Auxetophone
If possible, try lowering the stylus on a disc without the platter turning, and then rapping on the wall, platter, plinth, platform etc with volume at realistic loud levels to get some insight into what is happening.

Although I appreciate the reasoning, rapping on the platter (and perhaps even some of the others)sounds a dangerous proposition as the platter can easily be disturbed in the wrong direction leaving the owner with an expensive headache....
I'm not even sure that previously securing the platter gives the required degree of confidence. Very much done "at risk".
glai's avatar
glai
446 posts
 
Minus K isolation works great for me.
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