As the guy who originally discovered the microphonic issue, I can assure that it affects receive too. I found it by noting sidebands on received audio due to the internal speaker modulating the synthesizer.  External noises can do the same.

Wes  N7WS

On 10/31/2019 8:44 AM, Keith Trinity WE6R wrote:
We still have them, K3STFNR
It comes up on the website.
It is for mechanical vibration pickup dampening, mainly needed on the Main as that is used in TX.
Keith WE6R

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