TPS II 2Ch Tube Preamp System LED In Meter /Analogue Out Meter 1UDesigned as the ideal preamp for any application, the tube driven TPS II and DPS II add warmth and texture to any audio source. These two channel high performance preamps use a hand selected 12AX7A tube in the low noise input circuitry. This, coupled with ARTs proprietary V3 (Variable Valve Voicing) and variable input impedance allow the TPS II and DPS II to deliver incredible performance from cost effective single space rackmount solutions. V3