Sylvania 6C8 6C8G Vacuum Tube NOS NIB 6SL7 Substitute Consciousness This GE 6G11 tube tested

This GE 6G11 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box RCA 6HS5 tested to spec on our Paul Hart-calibrated TV7/U

but as you can see

Thia new old stock

Three are milspec

Sylvania 6C8 6C8G Vacuum Tube NOS NIB 6SL7 Substitute Consciousness This GE 6G11 tube testedThis beautiful new old stock, new in box Sylvania MANUFACTURED, Sparton LABELED 6C8G dual triode was tested on our Paul Hart calibrated for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 44 45 where minimum (65%) is 25 and 100% is It has a D getter; steel snubbers for lowered microphonics; dark gray rounded plates and excellent flashing. I have played it (with an adapter) in one of my AC heated Sound Craftsman