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

Tubes can have microphonics, and they are easily measured and heard. Soli state, not so much. P-P wiring does away with PCBs, but the wires can ring - audibly and measurably in a P-P wired tube amp also. So at what frequencies did the micro-resonances occur? You can change the frequencies by mass loading the PCB or you can absorb them by mounting the PCB on Sorbothane.

@panzrwagn “what frequencies did the micro-resonances occur?”

Don’t hold your breath or bank on an answer

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.

@mrdecibel 

I would hope no one questions the fact that certain components emit vibrations. Transformers, as you pointed out, are a prime example.

The question (asked more than once but not answered yet) remains, do these vibrations affect the sound quality of purely electronic audio components (say, amps or preamps as opposed to analog mechanical transports such as turntables)?

If so, it would be interesting to understand the mechanisms through which sound quality is negatively impacted.

Electronic components are known to perform to spec under harsh conditions. Witness automotive, aerospace, etc. applications.

In the hifi world, ordinary, inexpensive components, passives and semiconductors, are routinely exposed at length to extreme vibration and shaking in plate amps and crossovers. It is not known that these devices’ performance is negatively impacted in any way; in fact, if it were, you could be certain that passive crossovers in all high-end speakers would be outboarded to separate enclosures, and obviously that’s not the case.

I am actually really interested in learning about this.

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.