Hytron 12SN7 JAN-CHY-12SN7GT Milspec T Plate Vacuum Tube 1st Quarter BW03 All have JABO codes

All have JABO codes

This Hytron JAN-CHY-12SN7GT milspec dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

8 milliamps while transconductance measured 2440 micromhos

but also have much lower gain

Hytron 12SN7 JAN-CHY-12SN7GT Milspec T Plate Vacuum Tube 1st Quarter BW03 All have JABO codesThis 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