Nope.. the Tesla pictured is a 12AU7. What you're seeing in my picture is a "socket saver" (from TubeMonger) that I use to maintain the integrity of the Crack's input socket. Since I roll input tubes fairly often, I'd rather the adapter socket wear out (which is easily replaceable) rather than the Crack's input socket. The "vibration reduction" feature is hit or miss, IME.. for a couple of more microphonic tubes I had, it actually worked well.. for a couple of others, not so much... so YMMV.
How's that socket saver working out for you? There are times I feel like it's interfering with the sonics and times when it's not.