Matched Pair Sylvania 50L6 Vacuum Tubes NOS NIB Oliver Cromwell And new in box US-made 1P5GT

new in box US-made 1P5GT tubes tested to spec on our Hickok 800

Transconductance measured 77 for both tubes where minimum (65%) is 40

They are somewhat microphonic

52 and 58 where minimum (65%) is 40 and 100% is 62

Matched Pair Sylvania 50L6 Vacuum Tubes NOS NIB Oliver Cromwell And new in box US-made 1P5GTThis new old stock (from a bulk box) loosely matched pair of Sylvania 50L6 output tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 78 and Tube Two measured 84 where minimum (65%) is They both have copious quantities of flashing; O getters; gray plates; round mica spacers and anode radiators for cooler operation and longer life. They have DR and BR date codes,