This RCA 6AU6 Tube is a single NOS/NIB tube that has been fully tested.

Original box only shows minor signs of wear from being in storage. Pins should be cleaned prior usage.

Tested per user manual procedures on recently calibrated Hickok 6000A.

Passed all tests:

Filament Continuity Test: Passed

Shorts Test: Passed

Quality Test: Passed

Mutual Conductance Test: New: 2500/2300 (New minimum)

Gas (Grid Current) Test: Passed

Life Test: Passed