<i>&quot;Let’s take a quick detour and look at vibration damping. Vacuum tubes, and certain components in very high gain circuits like phono preamps, can be “microphonic”—vibrations can affect them in audible and measurable ways&quot;</i><p>OK, I&#x27;ll do the reading (verbose-ness!).<p>The quote above makes a degree of sense - I can remember valve based consumer electronics and having fun with the microphonics. Dad used a piece of dowling with a grommet on the end to check for valves that &#x27;rang&#x27; so he could replace them.