Yeah, the Sachs Model 2 will get u done...
http://www.dsachsconsulting.com/custom%20line%20stage.html
I believe the Atmasphere MP-3 also offers this feature. Both outstanding preamps! They don't have physically separate L/R volume controls, but they have separate gain stages for both channels and a master volume control. Ignore either at your peril.
http://www.dsachsconsulting.com/custom%20line%20stage.html
I believe the Atmasphere MP-3 also offers this feature. Both outstanding preamps! They don't have physically separate L/R volume controls, but they have separate gain stages for both channels and a master volume control. Ignore either at your peril.