Matched Pair Sylvania 6K6 6K6GT Vacuum Tubes NOS-Testing

Matched Pair Sylvania 6K6 6K6GT Vacuum Tubes NOS-TestingThis new old stock testing matched pair of Sylvania MANUFACTURED 6K6GT tubes was tested on our Maxi Matcher 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 40. 6 milliamps' plate current and measured 1830 micromhos. Tube Two measured 42. 4 2150. New nominal is within one standard deviation of 1900. These tubes have copper support rods; rectangular mica spacers; anode

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

where minimum (65%) is 18/18 and 100% is 28/28

Transconductance measured 27 for Tube One and 30 for Tube Two where minimum (65%) is 25

This lot of four Emerson coated glass 50L6GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box GE 1821A / Z-1879A is still sealed in its plastic baggie

This new old stock-testing trio of RCA 6K7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance: 1541 / 1532

new in box Hytron 6AD7G tube tested to spec on our Paul Hart-calibrated TV7/U

They measured 18

This paperback book is in good / very good condition

This softcover book is in good condition

They have late 1930s retro styling with coke bottle glass envelopes and mesh plates