I acquired this item used. I am selling it because I no longer need it. The meter panel is cloudy. Please check the photos for the vacuum tubes and other details. Voice valve preamp with tube warm function, featuring output protection limiting. - Model: Studio V3 - Type: Voice valve preamp - Output Protection: Output protection limiting - Features: Tube warm switch - Input: +48V phantom power - Gain Adjustment: +20dB gain - Power Adapter: Included AC adapter Thank you for looking.