Matched Pair RCA 6BL7 6BL7GTA Vacuum Tubes NOS-Testing Nonal NOS NIB a round mica spacers and

a round mica spacers and gray plates

Not for use in guitar and bass amps

There was no gas and it tested 2170 micromhos with a plate current draw of 25

Two are 1X2C and the other three are 1X2B

Matched Pair RCA 6BL7 6BL7GTA Vacuum Tubes NOS-Testing Nonal NOS NIB a round mica spacers andThis new old stock testing matched pair of RCA 6BL7GTA dual triodes was tested on our TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 50 50 while Tube Two measured 49 54 where minimum (65%) is 25 25 and 100% is 38. 5 38. 5. These tubes have steel support rods; short bases; beefy black plates: side O getters; anode coolers for cooler operation and longer life. Both have BW date codes. I played them in my Alan