Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes NOS NIB T67 Backup T15 new in box Raytheon 10KR8

new in box Raytheon 10KR8 tubes tested to spec on our TV7/U

black and silver bottles and 1-35 188-5 and 1-04 188-5 provenance/date codes

This matched pair of GE 6K6 6K6GT tubes was tested on our Maxi Matcher 2 with 325 volts on the plates and a bias of -36 volts for shorts

It measured 58/50 where minimum (65%) is 40/40 and 100% is 62/62

D getters and short bases

Matched Pair General Electric GE 6BL7 6BL7GTA Vacuum Tubes NOS NIB T67 Backup T15 new in box Raytheon 10KR8This new old stock, new in box matched pair of GE 6BL7GTA dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 56 56 for Tube One and 58 58 for Tube Two where minimum (65%) is 25 25 and 100% is 38. 5 38. 5. They have chamfered top O getters; steel support rods; great flashing; stout gray plates; anode radiators for cooler operation and longer life and