Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Valves Triple 3 Mica Black Plates December 20 2023 a goal post getter

a goal post getter

new in box Amperex 9ED4 tube tested to spec on our Paul Hart-calibrated TV7/U

Transconductance readings are 15

They measured (from left to right) 28

Both tubes measured 25 where minimum (65%) is 22

Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Valves Triple 3 Mica Black Plates December 20 2023 a goal post getterThis matched pair of Sylvania 6BL7GT dual triodes was tested on our TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 47 44 while Tube Two measured 48 43 where minimum (65%) is 25 25 and 100% is 38. 5 38. 5. These tubes have copper support rods; beefy black plates: three mica spacers for improved mechanical stability and low microphonics; top D getters and anode radiators for cooler operation and extended life.