A new set of tubes for your Drake 2A or 2B receiver that uses 6BZ6, 6U8, 6BE6x3, 6BA6, 6BF6, 6AQ5, 6X4, and either of these three tubes 6AV6-6BN6 or 8BN8.  You will have to let me know which of the three tubes your set uses before I can ship.