National 7C4 vacuum tube new old stock in box
Tested with a calibrated TV-7D/U tube tester.
Calibration by Daniel Nelson.
Tested at:52
Average new:55
Minimum good:40
The minimum is equal to 65% of the life of the tube.
Tested for shorts and gas.
Date code:
NOS/Used: -
Construction:-
Glass: chromed
Base:
loctal
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!