I am using the Treasure tube with a DarkVoice 336SE amp. I am using it with an RCA NOS 6AS7G power tube. The combo is a marked improvement over the stock tubes. The stock tubes are not bad, it's just that the Treasure and RCA are much better. The Treasure sounded good from the start with no hum. Prior to getting the Treasure I was using a Tung-Sol 6SN7GTB with the RCA NOS 6AS7G. The pairing provided a wide soundstage and good clarity, but had a little more high end treble than I liked. The Treasure takes the edge off of the high end and adds nice texture to the low end. The soundstage is wide and clarity and separation are great. I think my tube rolling is complete for the foreseeable future.