Sonic Frontier power 2 6922 tube swapping

You would be sure which you liked better!! You might like Amperex with 6550's and the Siemans with KT-88"s. The possibilities are what make tube rolling enjoyable albeit expensive.

SF is always a different animal that is a known tube eater.Often it is a matter of what will survive. The Amperex is a sweeter airy tube but the Siemens has great extension and a undistorted clear strong signal that make it a holy grail.