Bought one of these for my VoxAC4TV and was hoping for a stunning tone and unfortunately I did not get what I was hoping for. From what I’ve read these are the tubes of choice for this amplifier. I currently have a JJ and prefer that tone as being tighter and not mushy like the Mullard. Maybe I got it bad tube. I tried them back-and-forth but in the end went back to the JJ. I wanted it to sound good but it just wasn’t the one. Always in search of the ultimate home.