Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes NOS NIB 7375 7576 This is a late-40s pressing

This is a late-40s pressing with some scratches and moderate surface noise

perhaps a 7

new in box RCA 14Q7 tubes tested to spec in our Jackson 648 Mutual Conductance tester

These two Zenith 6U7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

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

Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes NOS NIB 7375 7576 This is a late-40s pressingThis 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