[mikethedruid]

I always TEST all the tubes in any set I'm working on, but I don't replace the ones which test good. That would be a waste of money, not to mention a waste of good tubes, many of which are no longer being made. I do replace all the paper condensers, and electrolytics, and usually replace all the resistors also with ones of higher wattage since modern resistors are smaller than the old carbon ones. I also make sure to have a full set of good replacement tubes for the set.