Below is our current selection of 6922 and E88CC vacuum tubes. There are several alternative names and compatible tubes. Vacuum tubes such as 7308 and E188CC are considered some of the very best but are less common. More rare, is the CCa preamp tube that was sparingly made by Telefunken and Siemens. The standard 6DJ8 is also known as ECC88. In Russia, this preamp tube is called 6N23P or 6Н23П...More Details