Tube amp resources and web pages

Comparison of various tone stacks

http://amps.zugster.net/articles/tone-stacks#BlondeTwin

Yet another guy who's made a bunch of different tube amps in his spare time.

http://www.naturdoctor.com/Chapters/Amps/

AX84 - the cooperative tube amp project

http://www.ax84.com/

Tube Amp Schematics and equations

http://www.aikenamps.com/Equations.htm

DIY Tube Guitar amps

http://www.diyguitaramp.com/

Tube guitar amp schematics

http://www.drtube.com/guitamp.htm

Fender and Ampeg schematics and layouts

http://www.turretboards.com/schematics_library.htm

MOSFET tremolo circuit

http://www.geofex.com/Article_Folders/sstremolo/sstremolo.htm

Terry Downs technical notes

http://terrydownsmusic.com/technotes/TECH.HTM