Condition: NOS/NIB - Amperex 7316/ECC186 *PQ* premium quality long-life replacement for ECC82/12AU7. One of the finest ECC186/7316 you can find with D-getter. Still in original Green/Yellow box labeled for General Dynamics. Production date: 1963. Remark: Cathode to heater voltage for ECC186 is 90Volt vs 180Volt for the ECC82.