Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Fawcett Columbine This new old stock-testing matched

This new old stock-testing matched pair of RCA 6BL7GTA dual triodes was tested on our TV7/U for shorts

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

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

but the bottle

a crenelated

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Fawcett Columbine This new old stock-testing matchedThis 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