This is kind of joke. It doesn’t actually work. I ordered two Mullard EL38s for my Euforia but, through a computer error, only one came, so I decided to put it in my Vali. 6922 socket saver -> 6SN7 adapter -> EL38 adapter -> EL38 tube. Lots of noise and only one channel works. This tube is not meant to be a driver tube. It’s meant to be a power tube as part of pair. I don’t think I damaged my amp because it works fine after putting my 6SN7 back. Maybe I destroyed the tube. I won’t know for another month when the other Mullard comes in. It’s a good 8 inches tall.