Mullard 6AB8 ECL80  vacuum tube new in box  
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.
Tested at: 66/37
Average new: 59/33
Minimum good:35/20 
The minimum is equal to 65% of the life of the tube.
Tested for shorts and gas.
Date code: 0916 1022
NOS/Used: new
Construction: gray plate square getter copper rods 
Glass: clear
Base: -
30-day free return.
We combine shipping $1.00 for each extra tube purchase.
Your items will be packed very well and shipped promptly.
Always glad to answer any questions.
Thanks for looking!