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(Bob-Stanton) said:

A 100 pf capacitor, with 0.5 inch leads, becomes an inductor above 200
MHz.

Fields couple RF stages together and give strange unpredictable
results. There is more complexity in an RF design than is apparent
from the schemetic.

In my opinion, the same goes for audio.
RFI is a much bigger problem than most people think.
Have you ever tried to keep an oscilloscope's probe in the air in
mid-city?
I've seen audio amplifiers producing distortions and even Dc shifts
due to a cellular phone in the vicinity.
that's easily measured, but not so easily cured.

--
Sander deWaal
Vacuum Audio Consultancy