Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes Copper Support Rods RCA Steel Plate I played this tube this

I played this tube this morning it in my Bottlehead Crack headphone amp with Sennheiser SD 580s and it sounded excellent

new in box International Servicemaster 6CG8A tube tested to spec on our Paul Hart-calibrated TV7/U

They measured 65

They have been tested on our Paul Hart-calibrated TV7/U where minimum (65%) is 40 and have the following values in descending order:

Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes Copper Support Rods RCA Steel Plate I played this tube thisThis matched pair of General Electric GE 12SN7 12SN7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 63 65 and Tube Two measured 66 64 where minimum (65%) is 50 50. Both tubes have gray, ladder plates; side horseshoe getters; crenelated, gapped, top mica spacers with smooth sided rectangular bottom mica spacers; copper support rods and great flashing. They