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How to isolated stand from springy floors?

I currently have a relatively heaving stand with a couple tube amps and a turntable on it. My big issue isn't really sound quality but my concern over tube life. My Manely Stringray II makes an audible tube rattling sound when ever my fairly light self walks by and I hoping I can come up with a fairly simple and hopefully cheap solution to this.

What would you guys suggest? Damping the underside of the shelf the amp is on comes to mind or possibly some sort of iso feet for the whole rack to cut down on vibration.
ohnofiasco

Showing 1 response by almarg

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almarg
9,670 posts
 
04-09-14: Czarivey
Usually bad tubes are more sensitive to mechanical disturbance.

04-11-14: Frogman
Before undertaking more drastic fixes, I would look for an extremely microphonic tube in the amplifier; replacing each tube one at a time to isolate the culprit(s) and also putting some isolation device under the amp.
Among the many comments that have been made I particularly second these. I'll add that another way of determining if a tube is excessively microphonic is by LIGHTLY tapping each tube with a pencil eraser, while the amp is powered up but no music is playing, and seeing (i.e., hearing) what happens.

Regards,
-- Al
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