Siemens Rohre E188CC 7308 Probably the best quality Drop In Replacement for the 6DJ8 E88CC tube available! These amazing tubes are known for their amazing soundstage and high fidelity. If you are an audiofile, you owe it to yourself to pick up a pair of these NOS tubes at an amazing price! Special price only $600 a pair!! This is a suitable replacement for any 6DJ8 tube type.