Microphonics or microphony describes the phenomenon wherein certain components in electronic devices transform mechanical vibrations into an undesired electrical signal (noise). The term comes from analogy with a microphone, which is intentionally designed to convert vibrations to electrical signals.

I heard mention of "Tube Dampers" on another thread and rather than hijaking that thread i thought i'd start a new one.

I was going to ask everyone what these were, but, i googled and found out. For those wondering here is a link
http://herbiesaudiolab.home.att.net/