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.
Sonic Frontier power 2 6922 tube swapping
Would there be any advantage in replacing the Siemens 6922 tubes with Amperex PQ white label tubes in my Sonic Frontier power 2 amp? The unit has the Siemens tubes that Chris recommends with the SE update.