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Re: idler noise-rumble

Posted by manfred88 on April 28, 2007 at 16:50:40

In Reply to: Ping Mosin, Tubesforever et al re: idler noise reduction posted by texanater on April 28, 2007 at 14:52:12:

I have one of Tubes L34 idler projects. I got it about 2-3 months ago and had quite a problem with a low mechanical noise in the beginning. On quiet passages-classical usually-there was a real problem. I'm not sure where the noise originates from, whether it's the idlers or the motor, I just don't know. So I started with adding some Dynamat around the base of the platter, close to the spindle. I also experimented with different armboard materials, I have a Rega RB250-Incognito-Mitchell weight. I also added stick on foam to the perimeter of the metal base, where it makes contact with the plinth. It was a little better. The armboards made the biggest difference, I have a piece of baltic birch glued to a piece of MDF, which is screwed to a piece of acrylic that mounts to the plinth. That made a huge difference, dead quiet. I also use a neoprene spacer to get the arm level up, actually I also used steel washers and acrylic washers, didn't seem to make a difference, sound wise. I have been using an Iron audio mat, which I thought cut the mecahnical sound even further, but today I started using my spot mat, Olly spots stuck on to an old flat LP. Still dead quiet. I also use the silicon nitride bearing.

I hope this helps somewhat.

Tom

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