Best way to dampen a micro-vibrating Printed Circuit Board inside an amp? Thanks!

I modify, dampen quite a lot inside a chassis, even those with point-to-point wiring. I start with isolating the onboard power supply transformer from the chassis, as all transformers vibrate / resonate, which is one of the reasons transformers are "potted" in some designs. I use many different materials, such as a Dynamat type product and some heat pipe tape. Types of silicon are also excellent. Ignore those nonbelievers. Amazing what chassis damping can do for the performance. Enjoy! MrD.

Yes, it all matters, for the better. There is much available to read on the subject. Microphonics is for real, and taming/reducing/eliminating them, is audible to my ears, in every case. Whether it is measurable, well, this is a common argument that continues to go on forever. Measurements vs hearing? Enjoy! MrD.