Looking for the perfect way to add great tone and reliability to your rig? Most knowledgeable tube users swear by USA NOS tubes versus some of the newer manufactured tubes. These JAN 5U4GB are guaranteed to outlive and outperform anything made these days. These won't be around forever, so take this chance to get an NOS USA made 5U4GB tube in your rig. These are perfect JAN tubes in original boxes from a case of 100 pieces.