There is two choices for this tube amplifier. THD 0.9% (at 28W). Vacuum tube 6CA7T×4(can use EL34×4) 12AX7B×2 12AU7×2.Package A YAQIN MC-13S unit A Power cable A manual Hex screw drivers to adjust bias 6CA7T/EL34×4. 2 Missing item or get wrong item or Get damaged items, DOA (dead on arrival). The item "YAQIN MC-13S EL34/6CA7T push pull Integrated Vacuum Tube Amplifier 40W2" is in sale since Saturday, April 13, 2019. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "hifimusic2014" and is located in Ezhou,436000. This item can be shipped worldwide.