i've been thinking that it would awesome to have a mini amp to use to test effects, and since the tiny giant amp layout has been verified, it got me thinking what about something that has at least one tube to help give the amp some tubey goodness, which should help get a better test how a pedal sounds with tubes as well. so after some searching i found this
the ruby tuby hybrid amp:
link to info about the circuit.
i also found this, the firefly and hi-octane,
link. i can't post the schematics for these as the schematics and wiring diagrams are pdfs.