Worth Having in your Collection
These are a good experimental tube. You won't know if you like them until you try them. Generally they are nice in the V1 position, but too fizzy in second and third gain stages. I also prefer a more expensive 3D sounding tube in the Phase inverter position than these. I put these in all positions in my 20 watt Krank Rev Jr., and smiled. That's the sound the amp was designed for. Kind of a dark scooped mids heavy metal over the top thing. You will need to trim off a bit of high end for recording to shape off the fizz, but great for chugging with heavy metal humbuckers and compression pedal. They didn't seem any more noisy than a 12AX7-A, but they have they're own character. To sum up, these are not a generic tone.