Before anyone says it, I've already googled and searchbar'd, but I wanted to ask opinions from people who might have used them.

I have a friend who's been playing about 20 years and is very comfortable with the insides of his amp, and long story short he wanted me to find a decent guide on biasing a Marshall JCM2000 amp head (if that even makes a difference). Anyone know of a good solid guide that won't steer him wrong?

Thanks in advance
-Guitar Gear-
1995 American Fender Strat, EMG 85 pup
Randall RH200 Head
Marshall 1960a Cab
Woods Acoustic
-Bass Gear-
Spector Legend 4 bass
Washburn Bantam bass
Hartke HA2500
Fender Bassman 410H
Play what you love, love what you play