We like the Telefunken Falcon Grade, Siemens 7308's and Siemens CCa's. CCa's have great midrange but not quite as much bottom and top as the Telefunken or Siemens 7308's. Personal taste operative word in this regard. We didn't like the Amperex being to dry. The mullards were bloated in the middle and not much extension. IMHO We have sold quite a few Kora pieces and have experimented quite a bit. This does not mean that these tubes exibit these same qualities in all gear. Just our experiences with the Kora products.
Hope this helps
Hope this helps