Component isolation

I'm not sure whether anything without moving parts requires isolation. Why would it? Can resonances actually convert into electrical signal? If so, can we hear them?

Some parts, absolutely. The ringing I described in the phono stage was most likely due to ceramic capacitors. The physical rapping causes movement inside affecting the distance of the plates to one another.

The problem I have is that we don't really measure how vibration affects solid state appliances, but it could be done.

Speaker isolation and eliminating the motion of speakers is an entirely different beast, and can be very effective. The cause/effect here is simple and clearly audible.

Best,
E

First, anything with a tube.

Next, in order of gain, so phono stage.

TBC, it's a real shame there isn't more research and evidence into vibration and solid state devices. Some gear will be more susceptible to microphonics than other gear just by part selection, construction methods, etc.

That being said, the worst bit of kit I ever had was a cheap phono preamp and it would ring like a bell if you rapped on it.

Much else is probably overblown.