Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods

Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support RodsThis 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 62 62 for Tube One and 68 60 for Tube Two where minimum (65%) is 50. Both have 3 52 188 5 date factory codes; short bases; copper support rods, horseshoe getters and excellent flashing. I am playing them in my Cern Audio phono preamplifier as I write. It is fed by a Rega

This pressing has lightly-moderate surface noise audible in quiet passages and barely-audible in moderate passages and louder

Their frequency response and sound-staging is excellent with airy mids and highs with great bass articulation as well

It measured 42 in its triode section where minimum (65%) is 25 and 100% is 39

This lot of three National Union number / type 58 stamped- / engraved-base tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Flashing Quality: excellent

This Sylvania 6DQ6B / 6GW6 tube tested to spec on our Paul Hart-calibrated TV7/U

This is a very-well-preserved LP

They measured 84/74 for Tube One and 87/73 for Tube Two where minimum (65%) is 57/57 and 100% is 88/88

Tube One: 75/70

a US Army Signal Corps anchor logo and a K4 date code

These take a little more current than 12AU7s

This tube has excellent flashing