Universal Audio UA-710TF Twin-Finity Mic PreamplifierThe award winning Universal Audio 710 Twin Finity Mic Preamplifier is a radical UA mic preamp design that combines both the classic retro warmth of tubes with the transient bite of solid state, all in a 2U, half rack unit. The 710 was created specifically to add the tonal versatility and sonic inspiration missing from generic audio interface preamps. Variable Tone blending Tone blending is continually variable between 100 percent tube and 100 percent