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

Angela-Gilbert Yeung is interesting.

I am at present having a Pre Amp' built that shares similarities to a Yeung design, as I will Monoblock Pre Amp's which are to have switchable Channels to enable 2 x Tube Options with different options for Gain and a SS Option with a increased range for adding gain.

There are both Single Ended Inputs / Outputs and a Balanced Input / Output 

I've watched a few of Angela-Gilbert Yeung's videos. 

If I had to hazard a guess, I would say that underneath the buffoonery lies a brilliant designer. Hence my curiosity toward their products.

@pindac 

The mono preamps you are commissioning are to have three separate,  selectable output stages, two of which are tube-powered and the third is solid state? Definitely interesting!

@davidplombier, I agree completely, as the smell of the acidity release, it is not pleasant......but after the curing/drying process, it becomes quite safe to use.  Excellent ventilation required during the application process. Almost 60 years, never an issue as a result of using it. Doors, windows, tubs and showers. It is used because it is faster drying, and yes, less expensive. It gets the job done, with a smile on my, and others, faces. 

@mrdecibel 

My point was that the acetic acid released during the curing process of the sealants you listed is corrosive to electronic components and circuit boards, and therefore to be avoided.

We are in full agreement about how unpleasant they are to use though. That stuff is nasty.

@awise1961 does your company test CCA's with the human ear, or just measurement equipment?

The Pre Amp' which is correct when referred to as commission built, has a Prototype SS Section already in use, which offered a Complex Internal Design for Earth Lifting, as well as a SS only Circuit which is as Transparent as can be.

When used with Valves the designer informs that it is the Valves that are only being heard, the pre is not an influence.

The Prototype Pre' was also produced with the option to add gain up to 13dB.

I have used all the options in my system and done assessments with other friends sharing a audio interest. The P'type Pre' has also been inserted into other systems.

It is so so revealing it catches one out, especially when not familiar.

So far it can be safely stated, good quality recordings are not wanted to be listened to without the pre in use once experienced.

The Valves on the final version will produce a Single Ended Pre Amp' that is solely to add two versions colour that can be tweaked to control the influences of each,  as an alternative to unadulterated transparency.

I was offered one Valve as an option that would have been very closely matching the Transparency of the SS, but that was not my objective.

Different and discernible influences were to be the goal, Tube Rolling is a favoured side hobby in Audio Equipment experiences. Additionally, I do loan owned equipment to other non owned systems on a regular basis to help others find their experiencing a produced end sound that is created to meet with their preference.  The Amp design and Tube Rolling Options will assist with others who are being investigative.      

No, the solution involves a 20kg bag of cryogenically-treated horse manure, which is what this thread deserves.

Invalid,

If we can hear sound emanating from a video or GPS cca there is indeed a problem. Actually, if you can hear sound coming from any cca, I would estimate that a problem exists. Most of the cards we build go through a final, full functional test simulating what it is expected to do in the real world. As of late, a guidance cca for the Tomahawk missile has the most stringent of test requirements. However, in my private world, I do not sign up to reviewers of audio gear who pass judgement based solely upon test data. I’ve assembled my system based on how it sounds to me. I really appreciate your questions. You made me think. This type of healthy banter is what makes this forum so much fun.

• @jasonbourne71 So now we’re denying microphonics?

I worked as an electrical engineer for over40 years and have personally designed and tested hundreds of printed circuit boards for both military and commercial designs, and have reviewed many more customer PCB designs as well.  Audible noise coming from a CCA is pretty rare in my experience, but I have seen (heard) it.  If I recall correctly the last time we tracked it down to microphonics in a multi-layer ceramic capacitor.  Had to redesign that part of the circuit to fix it.

@ awise1961  

I can remember doing those vibration tests on a military computer.  System failed almost immediately.  Opened the chassis and the inside was littered with sheared off components, mostly larger electrolytic capacitors.  We had to encapsulate them in silicone.

Thanks to all who gave positive and helpful thoughts, and vice versa.

I put “E Fusing 900 Flex” moldable, non-hardening silicone putty in long lengths under the edges of the PCBs where possible…and yes, the sound is that bit less smeared and clearer, more detailed… so it was cheap and I’m cheerful!    

what is a recommended way(s) to dampen

Apply water ;)