To get the standard comparison measurement, do you measure the full length of the tube to the far ends of the metal caps at each end? Or just to the closer inside ends of the metal caps? Or...?
How did you find out the max amp at which your tube should be driven? It is hard to examine my tube due to all of the stickers and electrical tape but so far I have not found any information etched to the tube or or printed on a label. I am going back with a flashlight an mirror to look some more.
Thanks!