Western Electric WE311B Mini Power Tube
This is a small power tube made by Western Electric. Very wide range and pleasant sound It is popular even as a single.
Due to limited stock, it may take some time for stock to arrive once sold out. It seems like it will take a while.
The price is for a set of two.
It appears to be NOS, but since it is unknown, I will list it as a used item.
Pass/fail judgments are made using the USA vacuum tube tester TV-7D.