Two GE 6BL8 ECF-80 vacuum tubes made in England 
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.
Tested at: 52/63 52/57
Minimum good: 34/36
The minimum is equal to 65% of the life of the tube.
Tested for shorts and gas.
Date code: CI 118-5 
NOS/Used: new 
Construction: gray plate round getters copper rods 
Glass: clear
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!