Ryllau- I have the 805c amps. I replaced the Kron with the WE and found a subtle but clearly audible increase in sweetness and delicacy. The Kron is a very good tube in terms of frequency extension, but it does have a rather direct presentation in comparison to the WE. Is it worth the cost difference? That's obviously dependent upon the level of the rest of your system and your personal preference. In my case, I found it worth the cost of a slightly used pair of WE to find out. I'm glad I did. Good luck.
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