Every brand of new tubes sound different.The same goes for NOS tubes.Most new tubes just don't sound as good as the old tubes.The good news is,the new tubes are starting to get better.The old tubes were made for years,and perfected.Then transistors came along.The new tube makers just don't seem to have it down yet.They may have made tubes for years,but not audio tubes.The Russian tubes were made mostly for the military,not audio.But they are working on improving their audio tubes.The old tubes keep getting more expensive because the world is running out of them.
