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To be sure, there are many other causes of resolution loss.

I just picked on RF noise, as it is impossible to completely eliminate it and its effects. The best we can do it get it down as far as possible.

Another major problem is acoustic vibration: equipment, wires, AC outlets. All equipment IME is susceptible to degradation from acoustic vibration, but it is easiest for non-technical audiophiles to visualize the problems inside vacuum tubes. The elements are made of very stiff and light bits of metal and wire. Just hold one up to your ear and tap gently on the envelope. Motion of the elements with respect to each other modulates the signal by changing the element spacings.

If applying dampers to the tubes improves the sound, doesn't that suggest the setup before the damping application was not fully resolving the signal? A similar question applies to improvements in sound from tweaking, say, CD transport supports or AC outlets. If we can hear that something not part of the signal has gone away by making such a change, then it follows that the artifacts were audible prior to the change and were distracting us to some extent.

While a more detailed and formal discussion of the definition of "resolution" would allow for ability to detect truncation errors in a system that is not presenting all the information due to a variety of issues, I think it is fair to say that one way to be sure a system is fully resolving all the information on Redbook CDs includes showing that no conceivable tweak can make an improvement in the sound when the system is playing CDs.

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