Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes NOS NIB 7375 7576 51/50 and 51/51

51/50 and 51/51

respectively where new/nominal is within one standard deviation of 5000

I have played them in my Radio Craftsmen RC-2 monoblocks (with adapters -- not included) and they sound outstanding

As you can see

Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes NOS NIB 7375 7576 51/50 and 51/51This new old stock, new in box (For Tube One) matched pair of GE MANUFACTURED 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 49 50 for Tube One and 50 50 for Tube Two (RCA LABELED). where minimum (65%) is 25 25 and 100% is 38. 5 38. 5. They have O getters; copper support rods; great flashing; stout black plates; anode radiators for cooler