Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes Valves NOS NIB May 16 2025 new in box US-made number

new in box US-made number / type 89 tubes tested to spec on our Paul Hart-calibrated TV7/U

3 rather than 7

new in box National Union type 43 tubes tested to spec on our Paul Hart-calibrated TV7/U

280 739 and F1 date codes

These five new old stock

Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes Valves NOS NIB May 16 2025 new in box US-made numberThis new old stock, new in box matched pair of GE 6BL7GTA dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 44 45 for Tube One and 45 45 for Tube Two where minimum (65%) is 25 25 and 100% is 38. 5 38. 5. They have O getters; copper support rods; great flashing and 63 48 188 5 and 64 13 188 5 factory date codes, respectively. I played them in my Alan