I have got a Soldano Avenger 50W with no loop. Going for Clapton tones. I'm a guitar-> cable-> amp kinda guy and have little experience with NOS tubes. The one experience that I have is with a NOS Tesla E83CC and it was great, what a difference! I was thinking of Tungsram specifically after reading some good reviews about it. Maybe an RFT...but I am open to any suggestions, much appreciated guys. Thanks.