Aikido vibration issue

Freecrowder · 18th December 2008, 01:50 AM

I am building an Aikido line level pre. I have all of the componenents mounted to an aluminum toplate. When I power it up I can feel a slight vibration when I lightly brush against the plate with my finger. This must be from the Trannie. I have rubber mounted the trannie and I can still feel it. The aikido board is mounted on stand-offs and when i touch the tubes I don't feel the vibration. So is this something that will have an audible consequence? Also I only feel it if I'm brushing lightly. If I touch it with any pressure I don't feel anything.

HollowState · 18th December 2008, 02:31 AM

Are you sure it really is a vibration? I have felt very similar sensations with a light touch from ungrounded metal work. Your chassis should have a good direct ground through a third wire in the power cord. If not, give that a try.

Freecrowder · 18th December 2008, 02:52 AM

That is a very good point the chassis is not grounded currently! I will try that and report back.

nhuwar · 18th December 2008, 04:23 PM

That sensation gets worst the higher the voltage is. You should feel what it's like at 15kv, like a paint shaker LOL.

Freecrowder · 23rd December 2008, 01:15 AM

Great troubleshooting! Grounded the chassis and everything is fine. There is some wonderful talent on this site.

18th December 2008, 01:50 AM	#1
Freecrowder diyAudio Member Join Date: Jun 2007	Aikido vibration issue I am building an Aikido line level pre. I have all of the componenents mounted to an aluminum toplate. When I power it up I can feel a slight vibration when I lightly brush against the plate with my finger. This must be from the Trannie. I have rubber mounted the trannie and I can still feel it. The aikido board is mounted on stand-offs and when i touch the tubes I don't feel the vibration. So is this something that will have an audible consequence? Also I only feel it if I'm brushing lightly. If I touch it with any pressure I don't feel anything.

18th December 2008, 02:31 AM	#2
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Are you sure it really is a vibration? I have felt very similar sensations with a light touch from ungrounded metal work. Your chassis should have a good direct ground through a third wire in the power cord. If not, give that a try. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

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18th December 2008, 02:52 AM	#3
Freecrowder diyAudio Member Join Date: Jun 2007	That is a very good point the chassis is not grounded currently! I will try that and report back.

18th December 2008, 04:23 PM	#4
nhuwar diyAudio Member Join Date: Jan 2007 Location: Cypress Texas	That sensation gets worst the higher the voltage is. You should feel what it's like at 15kv, like a paint shaker LOL.

23rd December 2008, 01:15 AM	#5
Freecrowder diyAudio Member Join Date: Jun 2007	Great troubleshooting! Grounded the chassis and everything is fine. There is some wonderful talent on this site.