I have updated http://www.schematicfinder.com and added a few hundred more guitar amp schematics.

Schematics added include; Kustom, Bogner, Park, Heathkit amp schematics, Carlsbro, Valco, Crate, Supro, Univox, Guild, Silvertone, Univox amp schematics, Sovtek, Magnatone, Elk amp schematics and Rivera amplifier schematics.

http://www.schematicfinder.com is a schematic search engine that parses multiple sites and returns only pro audio electronics schematic diagrams.

Hope you find what you are looking for !