X-Nico

Flicker noise

MOSFETs have a higher f_c (can be in the GHz range) than JFETs or bipolar transistors which is usually below 2 kHz for the latter.

Tube sound

In 1982, Tom Scholz, a graduate of MIT and a member of Boston, introduced the Rockman, which used JFET/BJT-based operational amplifiers and diode-based clipping circuits, but achieved a distorted sound adopted by many well known musicians.

see also