nice amp. have you considered contacting Rogue directly? I did and got a fairly prompt response from the owner.
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E-mailed Mark @ Rogue and he's categorically stated that KT66's shouldn't be used
" I would definitely not use the KT66 as the plate voltage is too high for that tube."
Which is a bummer saying as I had already ordered them so have to try and exchange them for Gold Lion KT77's and a Telefunken pre amp tube on his recommendation.
And yes they are second to none in the customer support role as well as their products.
Have fun everyone :-)