Tubes are identical in construction
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.Tested at: 93/87 plate current 10.7/9.9
80/85 plate current 9.1/10.7
Average new: 83/83
Minimum good: 50/50
The minimum is equal to 65% of the life of the tube.
Tested for shorts and gas.
Date codes WLT, 56-43 Construction: offset black plate [ ] getter copper rods
Glass: clear
Base: tight
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!