Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods 12EM6 Nonal This low noise JJ 12AX7

This low noise JJ 12AX7 / ECC83S dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

Four are civilian and one is milspec

This matched pair of RCA 6N7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance measured 35 for Tube One and 36 for Tube Two where minimum (65%) is 25 and 100% is 38

milspec Sylvania GB-6X4WA was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods 12EM6 Nonal This low noise JJ 12AX7This matched pair of GE 6SN7GTB dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 66 62 for Tube One and 67 64 for Tube Two where minimum (65%) is 50 50. They have 56 26 188 5 and 57 39 188 4 date provenance codes; tall bases; side horseshoe getters; copper support rods and great flashing. I have played them in my Radio Craftsmen RC 2 monoblocks and