Be careful with the KR845 tubes as they do not have the same electrical parameters as the standard 845 tube.
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Thanks for the responses.
My amp is autobias with bias pots so I may stuck with a typical 845 parameter tube.
The transformers are really beefy on this amp, so I will check out the differences and see if I can try the KR's.
Are the KR's more like the 211 parameters, a half way between 211's and 845's or something entirely different?
Has anyone had 2017 experience with Elrog? I would like to try them, but the data I've found online is mostly from their early days and it was hard to tell if the troubled ones simply failed, or failed and caused amp issues (I never read definitively that the latter happened to anyone, and I also realize it's based on amp design too and the amp's fault handling capabilities).
If so, where did you buy them?