Matched Pair CBS Hytron 12SN7 12SN7GT Vacuum Tubes Black T Plates

Matched Pair CBS Hytron 12SN7 12SN7GT Vacuum Tubes Black T PlatesThis matched pair of CBS Hytron 12SN7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 75 70 for Tube One and 77 72 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have black T plates; D getters; steel support rods; excised chevrons in their top mica spacers as well as 210 5439 and 5413 provenance date codes, respectively. I have

there are a few scratches

RCA-MANUFACTURED) where new/nominal is within one standard deviation of 1900

new in box (for Tube One) matched pair of Sylvania 5879 tubes was tested on our Paul Hart-calibrated TV/U for shorts

Minimum (65%) is 33 and 100% is 51/51

IN OVER 6000 SALES

but the bottle is firmly-cemented to it and there is no movement at all possible

These seven 6A6 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box GE 6AS8 tubes tested to spec on our Paul Hart-calibrated TV7/U

There were no shorts and the final three tubes on the right might be a bit gassy

It measured a nearly-perfectly-balanced 84/82 where minimum (65%) is 50/50 and 100% is 77/77

THE PRODUCT DEVELOPMENT AND IMPROVEMENT CYCLE IS OVE

only six tubes are available