I went through the tube rolling phase with my CJ Premier 11a and 14 in my main system and was able to arrive at considerably better sound by doing that. I suggest that you make sure you have no polarity issues and then post your query on a tube board - other owners of your gear can offer specific suggestions on what worked for them.
You only have one tube (6922) IIRC so tube rolling won't be too expensive.
Take a look at this article - 17 different 6922s assessed.
https://www.head-fi.org/threads/6922-tube-review-17-top-6922-6n23p-e88cc-cca-7308-e188cc-tubes.761078/
You only have one tube (6922) IIRC so tube rolling won't be too expensive.
Take a look at this article - 17 different 6922s assessed.
https://www.head-fi.org/threads/6922-tube-review-17-top-6922-6n23p-e88cc-cca-7308-e188cc-tubes.761078/