Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes Copper Support Rods RCA Steel Plate new in box International Servicemaster

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

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

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 US-made 12A6 tubes tested to spec on our Paul Hart-calibrated TV7/U

It has a sheet getter

Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes Copper Support Rods RCA Steel Plate new in box International ServicemasterThis 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