RCA 5687 Vacuum Tube Black Plate TV-7 Tested Very Strong Good Balance

IBM branded made by RCA 5687 vacuum tube twin triode tested very strong Tested with a calibrated TV-7D/U tube tester. Calibration by Daniel Nelson. Code: 5820 NOS/Used: Used Construction: Black plate horseshoe getter copper rods Glass: No burn marks Base:- Tested at: 75/76 GM Average new 63/63 Minimum: 38/38 GM 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!