[Diabolical Artificer]

That's interesting Dave, I asked around about putting more voltage on g2 of the 807's and the consensus was it's ok as long as the max power limit wasn't exceeded. As g2 is tapped off the 43% tap, it's running at lower power. I ran the 807's at 400v HT and didn't experience any problem's. Still didn't feel comfortable about it though.

Devices be they IC's, transistor's or valves are from what I've gleaned conservatively rated on datasheet's. Take the power max of 25w of the 807 for instance ( "This rating is absolute and must be reduced under certain conditions" like AB2), on the STC datasheet it gives example's of running a pair at 47w and 80w !? Max g2 power is given as 3.5w but the AB2 example where a pair is running at 80w it says the g2 current at max signal is 21mA, which at 300v is 6.3w !?

Thanks for the input, video should be working, but isn't brilliant; will upload another. A.