Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods NOS-Testing Dutch Amperex new in box Westinghouse WL5642

new in box Westinghouse WL5642 tubes

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

It is MM wide from the extreme left to the tip of the winding stem on the right

This Philco 5Y4G rectifier tube tested 58/52 where minimum (65%) is 40/40 and 100% is 62/62

They have black plates

Matched Pair General Electric GE 6SN7 6SN7GTA Vacuum Tubes Copper Support Rods NOS-Testing Dutch Amperex new in box Westinghouse WL5642This 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