Tone loss on SS guitar combo amp

[Deadfret]

Randall Rg-80, SS Amp lost bass,have to cut way back on presence,middle,and treble wich makes a really bad under EQed synthetic bass. Where can I get a schematic?

[J M Fahey]

Well, right here !!!
*Use* the search function, that's what it's here for.
You'll find it as: http://www.ssguitar.com/index.php?action=dlattach;topic=1307.0;attach=817