Nearly every vacuum tube manufactured today is inferior to the originals, many from the 40's and 50's. They had secret metallurgy that is not available in today's tubes. Also, the manufacturers of most tubes have inferior quality control and technology that the old tube makers had.
What brand was better than it is today?
What are the brands of speakers or components that were once significantly better than they are today? Polk, Boston Acoustics, Bose? Keep them coming and explain why!!!