This a Biamp MR/140 spring reverb and 4 band equalizer made in Portland Oregon by Biamp Systems Inc.  The unit has XLR input and output and 1/4" unbalanced input and output.  Tested and working well.  No scratchy potentiometers, everything is quiet.  Has Drive capability on input level control.  There's also a Balance between Dry and Wet, very useful when mixing and Output level control.  See photos in great shape.  Thanks for looking.