Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes Copper Support Rods RCA Steel Plate I played them in my

I played them in my Alan Eaton single-ended 45 amplifier (as an "excellent" 6SN7 substitute according to Antique Electronic Supply's "Tube Substitution Guidebook") and they sound outstanding

It measured 65/70 where minimum (65%) is 50/50 and 100% is 77/77

It has a sheet getter

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

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

Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes Copper Support Rods RCA Steel Plate I played them in myThis 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