Swapping a BJT with a MOSfet...?

[Steben]

IS it true that

1. this an easy thing to do without much rebiasing as long as a suitable fet is chosen?
2. this gives softer distortion but more noise?

[WGTP]

I have done it in Fuzz Faces, but the bias may require some adjustment.  Gave a different character to it. 

[gez]

IS it true that

1. this an easy thing to do without much rebiasing as long as a suitable fet is chosen?
2. this gives softer distortion but more noise?

You can sub them in but the thresholds are usually around 1V min, often more, and they vary from device to device so you need a trimpot in there somewhere.  If you look at the input section of the EA trem at runoff, that's one way I do things to solve the bias...all depends on the circuit.

They're quieter than bi-polar trannies.  Softer distortion if you use CMOS