Dumble blues master circuit

[pazzo63]

hi,i'm looking for some informations about "blues master circuit",i know that amp came out in the late 80 s,and it had the tone stack after the od 2 cap.i'm looking for some schematics,nobody seems to care about this amp although,it's a totally different amp from the normal 80.s ods that everybody is looking for.i know the mid and bass cap were both 0.22 caps,but i d like to know more about it.Thanks in advance for the help devo