Description
 
Pair 6E2/6HU6/EM87 NOS Tuning Eye Vacuum Tube Indicator LOW Level Input
 
Replaces 6HU6 and EM87 tuning eye tube types.
Assorted brands in stock. 
Note: The Chinese and Russian equivalent is 6E2.
 
What does "NOS" mean, anyway?:

Commonly known as "NOS,"
the term New Old Stock simply refers to tubes that were made years ago
but have never been used. Much like antiques,
"NOS" tubes are currently not being manufactured and
this means their supply is dwindling while the price continues to rise.