Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods Vintage Parts This new old stock-testing matched

This new old stock-testing matched pair of Shuguang 6L6WGC output tubes was tested on our Maxi-Matcher 2 for shorts

This new old stock-testing matched pair of milspec RCA 1619 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Pictures Three and Four are included to underscore this fact

had excellent frequency response and was very quiet

Tube Two measured 48 46 56

Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods Vintage Parts This new old stock-testing matchedThis matched pair of GE 6SN7GTA dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 53 53 for Tube One and 56 56 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have 4 48 188 5 and 4 43 188 20 date factory codes; copper support rods, horseshoe getters and excellent flashing. I have played them in my Cern Audio phono preamp and they