Tubes are identical in construction,
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.
Date code: 59-48 188-21, 59-22 188-21
NOS/Used: new
Construction: black plate [ ] getter
Glass: clear
Base: tight
Tested at: 79 plate current 20.6
83 plate current 25.6
Average new 83
Minimum good 50
The minimum is equal to 65% of the life of the tube
Tested for shorts and gas.
30-day free return. Your items will be packed very well and shipped promptly.
We combine shipping on tubes.
Always glad to answer any questions.
Thanks for looking!