I tried different tube variants when I owned a Zoe and kept coming back to the 6922. The 7308 is a more robust 6922 and is in the same family. Personal favorites were Amperex PQ White label 6922 or 7308. Depending on your system, using other tube types may help push the sound one way or another, but I thought the 6922 variant let the Zoe sound the best it could be.
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