Front Panel ✎ Cellular phones or mobile devices placed near the vacuum tube amp or electronic products placed on the top of the product can cause audio noise or distortion. ✎ When the product is on, do not let children touch the product's surface. It will be hot. ✎ To upgrade the product's software through the USB jack, you must use a USB flash drive. ✎ When the product displays a Blu-ray Disc m..
