New production KT88s or KT90s at 850v plate?

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I know the data sheets have lower plate ratings than 850v but has anyone tried them this high? With 300V on the screen as well.
I'm rebuilding a pair of Optimation amps originally fitted with 8417s. I know EL34s will work in this super pentode operation I have a pair of Bogen KO100 s that run 800 plate and 450 screen for a smok'n 90 watts using a pair of EH EL34s with surprising good sound.
What do y'all think can I push new KT88s or KT90s that high?
Thanks, Scott

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Topic - New production KT88s or KT90s at 850v plate? - Scholl 08:38:46 03/10/03 (1)

B+ is 645 not 845, no problem. NT - Scholl 15:07:56 03/10/03 (0)

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