This listing is for a pair of vintage NOS (New Old Stock) Raytheon type 6AU6A vacuum tubes with black ribbed plates.

These tubes have matching date codes and are in the original boxes.  

This tube tested great on a reliable Hickok 800A tube tester (a mutual conductance tester).

Here are the readings in micromhos:  2700 & 2700 - strong and perfectly matched!   ...and No shorts or gas detected!

 Ref:  New tubes should test at 2300 or more micromhos.

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