Fredenstein F660, Tube based compressor and limiter, same very short signal path as the Fairchild 660/670, newly produced 6386 LGP tubes, use a DSP to control the operating points of the tubes, large LCD-Display with Menu based User Interface, One Knob Operation, XLR I/O, Sidechain I/O XLR, Link-Function for Stereo-Operation with second F660, build-in Power Supply, Dimension: 19" 3U