Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods 12EM6 Nonal milspec Sylvania GB-6X4WA was tested

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

matching 9-39 date codes

This offering is for 3 subminiature X-ray suppression shields suitable for 6AU6-size tubes

This Raytheon 6JM6A tube is new old stock

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods 12EM6 Nonal milspec Sylvania GB-6X4WA was testedThis 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