Clasic preamp for live or recording! Big warm sound! It's a winner classic a must for a studio.Great condition. Not need it anymore.It's only been used a few time in my home studio. This will make sound any mic like a professional recording.The SOLO/610 delivers the classic Putnam 610 tube console sound in a portable, highly versatile mic preamp design. It provides the silky, vintage warmth of the original console’s mic amp design, and will flatter and enhance any microphone or instrument with its iconic tones.