YAQIN MC-13S Push-Pull Integrated Stereo Tube Amplifier(Without Protect Cover) MC-13S is the latest upgraded version of MC-10L. It is powered by Yaqin 6CA7T tubes which are better than Shu Guang EL34B in sound quality An analog VU meter on the front panel to monitor the average of the two channel output levels Class A push-pull power amplifier to reduce distortion Ultra linear push-pull amplifier provides greater output power Caution : the product don't have plastic cover. To ptotect the amp,tube and machine are packed individually. Please click:http://www.amazon.com/dp/B00A7IZN70 to buy the one with plastic cover