I just bought a1979 Electric Mistress on E-bay. It has EH 5100 D, and I think there maybe some mods done to it. Maybe I’m wrong but I can see some solder joints on the board where one of the chips is sitting. Can someone please post the pix of the EH 5100 D circuit board? I would like to compare mine to an original one. Also there is a significant volume drop when I turn the pedal on, is that normal?