Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods US-Made Nonal They have Y5E and 9-22

They have Y5E and 9-22 codes

outstanding flashing

(New US-made 6V6s typically test with plate current from the mid teens to mid 30s with transconductance from 1700 micromhos or so

copper support rods and good flashing

This Amperex Bugle Boy ECC189 / 7308 / 6DJ8 / 7DJ8 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods US-Made Nonal They have Y5E and 9-22This 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 70 68 for Tube One and 71 67 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have tall bases; white silkscreening; side horseshoe getters; copper support rods and great flashing. Their date provenance codes are 56 30 188 5 and 56 17 188 4, respectively.