Keavin:
The Dead never used Alembic equipment because they were paid. Alembic started life as a Grateful Dead spinoff. Alembic was part of the maelstrom of the San Francisco sound of the 60's, supplying instruments and sound services to not only the Dead, but the Airplane (Jack had Alembic #1), and the New Riders of the Purple Sage among others. David Crosby, a part of the 60's psychedelic family played one of the first, if not the first, instrument customized by Alembic - a Guild Starfire 12 string made of Brazilian Rosewood. I had the honor of playing it at the factory a couple of years ago when it was in for a tune-up.
Bill, tgo