This URL: http://www.univox.org/schematics.html has a collection of Univox guitar and bass schematics, both in tubes, and those dreadful little bits of silicon and sand transistor-thingies... Some "effects" as well.
Even the little 6BM8 powered U45B amp schematic, posted elsewhere on this site (DIY tibes, look under the 6BM8 topic) , appears here.
/ed B in NH