Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Fawcett Columbine The title basically says it

The title basically says it all

It measured 73 where minimum (65%) is 50 and 100% is 77

This matched pair of RCA Cunningham Radiotron Type 49 output tubes was tested on our Paul Hart-calibrated TV7/U for shorts

46 and 50 where minimum (65%) is 35 and 100% is 54

It has an engraved / stamped base

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Fawcett Columbine The title basically says itThis matched pair of GE 6SN7GTB dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and transconductance measured as follows: Tube One: 75 70 Tube Two: 79 74 Bogey: Minimum (65%) is 50 50; 100% is 77 77 Physical Characteristics: Bases: tall Bottles: medium height Date Codes: 56 13 and 58 43, respectively EIA Factory Codes: 188 4 and 188 5, respectively Getters: mid bottle, harp