I know, but honestly I have had them in there since I got it, and the guy before me had them for 2 years that way. They seem to be fine. I have read all the stuff from FJA, Eurotubes, and Peavey on the subject and no one has come to a conclusion as to whether its bad or not. I don't really run the amp at super high volumes, but I take care with it for sure. I have talked to hundreds of guys online that have been doing the KT88 thing for quite a while and no one has had any issues.
I dunno why, or how but it seems to work ....lol
The math doesn't support the idea I know, neither does the words of the "gurus" but it seems to work.
Yeah you should be alright, at the most you are just shortening the life of the power transformer.