Matched Pair RCA Cunningham Radiotron Number / Type 49 #49 Vacuum Tubes Shoulder ST Shape Septal T13 Transconductance measured 1800/1750 micromhos for

Transconductance measured 1800/1750 micromhos for Tube One and 1800/1775 micromhos for Tube Two

Tube One measured 47/44 while Tube Two measured 48/43 where minimum (65%) is 25/25 and 100% is 38

clear bottle 12SL7GT dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

This lot of four North American-made number 78 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

This tube has steel support rods

Matched Pair RCA Cunningham Radiotron Number / Type 49 #49 Vacuum Tubes Shoulder ST Shape Septal T13 Transconductance measured 1800/1750 micromhos forThis matched pair of RCA Cunningham Radiotron Type 49 output tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 31 and 32 where minimum (65%) is 28 and 100% is 43. They have engraved bases; dimpled sheet getters and terrific flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR