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

They have black plates

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

a Micanol base

THE BASE HAS BEEN MARKED FOR SAFE AND EASY INSERTION

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