Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods NOS-Testing Dutch Amperex new in box GE 9JW8

new in box GE 9JW8 tubes tested to spec on our TV7

(New 6AU7s typically test within a standard deviation of 2400 micromhos)

This Philco 5Y4G rectifier tube tested 46/46 where minimum (65%) is 40/40 and 100% is 62/62

They have black plates

new in box Westinghouse WL5642 tubes

Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods NOS-Testing Dutch Amperex new in box GE 9JW8This new old stock TESTING matched pair of GE 6SN7GTA dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 82 74 for Tube One and 84 74 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have short bases; white silkscreening; side horseshoe getters; copper support rods and great flashing. Their date provenance codes are 3 22 188 5 and 4 39