Turntable rumble?

bereanbill · 3rd May 2009, 09:51 PM

Hi...I picked up a Lab-420 TT at a local thrift stor for $5.00, and it functions well but has audible rumble. I have it isolated from the rest of my audio system...could I put it on a rubber pad...would that help? Is it possible for a cartridge to go microphonic and pick up rumble? It is direct drive...could there be a problem within the drive train?

tinitus · 4th May 2009, 03:46 PM

Feedback has always been a problem
Why the soft suspention was "invented"
A heavy block/shelf helps too

But rumble is a different matter

Anyway, you need a highpass subfilter

If possible try to lubricate the bearing with fine oil, used fore sewing mashines
Or maybe fine teflon oil

bereanbill · 4th May 2009, 09:28 PM

Where would I find a high pass sub filter? Light machine oil I have..always go with the least complicated (and least costly) solution first.

"You can't make chicken salad from chicken crap ! " My Grandpa

vinylkid58 · 4th May 2009, 09:53 PM

There is a manual for the Realistic LAB-400 in the: http://www.vinylengine.com/library/realistic.shtml
If you register, you can download the service manual.

Jeff

bikehorn · 4th May 2009, 09:57 PM

Quote:

Originally posted by bereanbill
Where would I find a high pass sub filter? Light machine oil I have..always go with the least complicated (and least costly) solution first.

"You can't make chicken salad from chicken crap ! " My Grandpa

This would be one option

http://sound.westhost.com/project99.htm

3rd May 2009, 09:51 PM	#1
bereanbill diyAudio Member Join Date: Jan 2009	Turntable rumble? Hi...I picked up a Lab-420 TT at a local thrift stor for $5.00, and it functions well but has audible rumble. I have it isolated from the rest of my audio system...could I put it on a rubber pad...would that help? Is it possible for a cartridge to go microphonic and pick up rumble? It is direct drive...could there be a problem within the drive train?

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4th May 2009, 03:46 PM	#2
tinitus diyAudio Moderator Join Date: Nov 2005	Feedback has always been a problem Why the soft suspention was "invented" A heavy block/shelf helps too But rumble is a different matter Anyway, you need a highpass subfilter If possible try to lubricate the bearing with fine oil, used fore sewing mashines Or maybe fine teflon oil

4th May 2009, 09:28 PM	#3
bereanbill diyAudio Member Join Date: Jan 2009	Where would I find a high pass sub filter? Light machine oil I have..always go with the least complicated (and least costly) solution first. "You can't make chicken salad from chicken crap ! " My Grandpa

4th May 2009, 09:53 PM	#4
vinylkid58 diyAudio Member Join Date: May 2005 Location: Victoria, B.C.	There is a manual for the Realistic LAB-400 in the: http://www.vinylengine.com/library/realistic.shtml If you register, you can download the service manual. Jeff

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