One 35W4 vacuum tube various brands tested good to strong.
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.
Tested at 54 54 54 51 54
Average new: 60
Minimum good: 40 
The minimum is equal to 65% of the life of the tube
Strongest tube will be shipped first.
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!