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Transistors' dirty little secret...

The junctions that form all types of transistors: bipolar, MOSFET, and JFET, have capacitances that vary with the instantaneous voltages across them. This means the signal modulates the open-loop bandwidth of a transistor amplifier stage.

Running a gain stage from a high supply voltage minimizes this variation. Running a high bias current reduces the effective resistance in series with the capacitance (as does shining laser light on it, ala Edge...).

Tubes don't have this particular problem, but all of them are microphonic to some extent.

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