Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Triple 3 Mica Black Plates Zenith 2BU2 NOS NIB 54 and 64 where minimum

54 and 64 where minimum (65%) is 50

These seven new old stock

but still usable especially in experimental situations where the tube might be damaged -- on our Paul Hart-calibrated TV7/U

5 record cleaner and then played on our Rega Planar 3

This Amperite 115NO10T relay tube tested to spec on our Hickok 800

Matched Pair Sylvania 6BL7 6BL7GTA Vacuum Tubes Triple 3 Mica Black Plates Zenith 2BU2 NOS NIB 54 and 64 where minimumThis 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.