5 Matched Sylvania 7A7 Vacuum Tubes NOS-Testing Lot Of Five Oxford University steel support rods and gray

steel support rods and gray plates

Tube One's centering pin is missing and it has been marked for safe and easy insertion

64/66 and 70/70 where minimum (65%) is 50/50 and 100% is 77/77

Flashing Quality: good (for this type

Tube One drew 20

5 Matched Sylvania 7A7 Vacuum Tubes NOS-Testing Lot Of Five Oxford University steel support rods and grayThis perfectly matched quintet of new old stock testing Sylvania MANUFACTURED 7A7 tubes was tested on our Hickok 800 for shorts, gas and transconductance. There were no shorts or gas and they all measured 2200 micromhos where new nominal is 2000 and minimum (65%) is 1300. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE PROBABLY HAVE IT. PLEASE ALSO SEE OUR ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU