- NOS NIB
- Tests Very Strong & Balanced
- Black Plates
- "Horseshoe" Getter
- Cu Grid Rods
- Date Code: 5-39
Value Added Tube
- Pins Cleaned & Straightened with Proprietary Process
- Tube Surfaces Cleaned
- Plug & Play
TESTING
TV-7A/U
Tube Tested on a NOS Reference TV-7A/U Tester
Tube Tests as Follows:
The Calculated Average for NOS 6BK7 Tubes is: 62/62. The Hickok Minimum for a 6BK7 Tube is: 43/43.
The Minimum Value is Defined when a Tube has 65% of it's Life Left.
Murphy's Law:
"All Tube Testers are Wrong but Some are Useful"
The results of your tube tester may vary from these measurements.