The Klyne is a flexible, low noise phono preamplifier with internal switches for gain (37, 50, 63 dB), impedance (6 settings from 75 to 47,000 Ohms), and high frequency contour (HFC). HFC is used to reduce mechanical resonances of MC cartridges at very high frequencies. HFC may also be turned off. The unit is an excellent condition but I give it an 8 only because is just under 10 years old. The unit comes with a separate power supply an an acrylic top (see photos) and a metal top. Serial number 6808563.