I have the 60 watt non graphic eq purple stripe with 2 6l6 power tubes. I have the Weber bias rite. Plate voltage measured 438 and the mA measured 36.9 to about 37 so according to eurotubes 6l6, el34, 5881, all are 25 watts where on webers site they have 6l6 at 30 watts and el34s at 25 watts so when I do my caculation 25 / 438 plate voltage = .057 (total dissapation(not sure if that is right word) and 37 mA is about 65% of that. now if I use the ted weber wattage for 6l6s 30 / 438 plate voltage = .068(Total Dissapation) and 37 mA is about 55% of that. so my conclusion is if I rate the 6L6 at 30 watts my amp must be very, very cold, and if use the 25 watt measuring for 6L6 the my ampo is biased about right. Am I right?