I'm planning on retubing both devices. (I contacted Mesa and they said not to worry about the 12AX7's inside the 2:90.) My plan was to retube the Triaxis with standard JJ's but I'm not sure about the 6L6's. I've read every post I could find and contacted The Tube Store and Tube Depot. I'm looking for an all around yet robust, low noise replacement for the stock Mesa 440's. It was suggested to try the Tung Sol. Can anybody shed light on this matter? I guess I'm trying to avoid "over buying" on the power tubes. I practice a few times a week and rarely push the gain the 2:90 or Triaxis. I play mostly smaller venues. As you can see, I'm not as sophisticated or as tone critical as some of the members here. All I'm looking for are sound suggestions. Thanks!