tube amp

got another ? i am wanting to build my own tube amp that has a clean channel only. why? i use a DOD death metal pedal that provides all the distortion i need. plus i have a few other pedals that i use. i only need a clean channel. i'm looking to build one that sounds like a marshall jcm 800. or a 900. i want that sound. anybody got any ideas where i can get some plans and some good instructions on building it? thanks!!!