This is a famous small preamplifier. The original vacuum tubes have been replaced with high-spec ones. It has minor scratches as it was only used indoors. Velcro is attached to the back because it was mounted on a board. Please check the photos. The black paint inside the VU meter is partially faded, but this does not affect its use. - Model: Studio V3 - Brand: ART - Function: Voiced Valve Preamplifier - Output Protection: Output Protection Limiting - Power: 9VAC - Input Gain Adjustment: +6/-40dB - Output Level Adjustment: +10dB https://www.electroharmonix.co.jp/art/img/digireco/96_tubemp_1.PDF