I'm hoping a "valve bash" is a good thing? The 6SL7/6N9P Hi Fi version from Shuguang can be made to please, as can the Sovtek version. On paper, the same as a 12AX7. However, the "sameness" ends there. Not long ago, no manufacturer was making the 6SL7 and all the NOS were in bad shape. Having designed gear with both, I find the 6SL7 capable (when used well) of dramatically better bottom end performance.