Pair of Sylvania 7R7 vacuum tubes
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.
Tested at: 48/55/54 46/51/52
Average new: 63/50/50
Minimum good: 38/30/30
The minimum is equal to 65% of the life of the tube.
Tested for shorts and gas.
Date code: -
Construction: black plate
Glass: chrome top
Base: metal 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!