No operational issues. There are signs of use, such as paint peeling. This is a modified TS mini. Taking advantage of the TS MINI, which boasts the 4558 op-amp, the 4558 has been replaced with a glossy 4558. The standard-sized glossy op-amp has been directly mounted, replacing the 4558 on the mounting board, to achieve a thicker sound image. Also, the classic 3-mode switch is installed. The 3 modes are LED, clipping-through, and silicon symmetrical, with a focus on the standard options. And of course, high-brightness BLUE is used for the LED indicator. Please note that this item is not subject to price reduction.