I look at this http://www.webervst.com/tubes1/calcbias.htm

and the rate EL34 as 25 watts and 6L6 as 30 watts. People at Eurotubes say to rate El34, 6l6, 5881 all as 25 watts. Who is right?

Plus to caculat bias you take the

wattge from a single tube so in my case lets say a an EL34 which gives you 25 watts. You then take the 25 watts and devided it by the plate volatge which lets say is 450V

so you would have 25/450 = 0.055 you would than should for what I am gathering is mostly recommended is 60% or 55% of the 0.055( which is 100% dissipation) o this gives you .033 for 60% which is right about average according to the website.

so I just want to make sure my formula is correct and most important how to rate the tubes in wattage. I dont wasnt to go by the eurotubes recommendation of saying the 6L6s are 25 watts and end up biasing an amp wrong if they are wrong by saying 6l6 are 25 watts when the Weber site was correct