Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Valves Triple 3 Mica Black Plates December 20 2023 They measured (from left to

They measured (from left to right) 28

top to bottom) 39

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

ladder plates

steel support rods

Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Valves Triple 3 Mica Black Plates December 20 2023 They measured (from left toThis 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.