Hytron 12SN7 JAN-CHY-12SN7GT Milspec T Plate Vacuum Tube 1st Quarter BW03 but also have much lower

but also have much lower gain

All have JABO codes

These four Super Silvertone 12A8GT tubes were tested for shorts

65 and 79 where minimum (65%) is 45

6 for 6SN7s

Hytron 12SN7 JAN-CHY-12SN7GT Milspec T Plate Vacuum Tube 1st Quarter BW03 but also have much lowerThis Hytron JAN CHY 12SN7GT milspec dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 42 49 where minimum (65%) is 50 50 and 100% is 77 77 It has steel support rods; black T plates and a bottom, side D getter. I have played it in one of my Radio Craftsman RC 2 monoblocks and it sounds outstanding. It is dead quiet when the preamp is muted and has excellent frequency