This vintage Knight Model 94 SX 712 tube preamplifier turns on and lights up. Not tested any further. Dimensions are approximately 3 1/2 high x 6 x 13 inches. The exterior case is extremely dirty with heavy dust, wear, fraying, and material loss at corners. The top has dark stains, and the control knobs show significant grime. Sold as-is, great for collectors or audio enthusiasts looking for a restoration project.