RCA 6BG6 6BG6G Vacuum Tube Output Tube Shoulder Shape NOS NIB

RCA 6BG6 6BG6G Vacuum Tube Output Tube Shoulder Shape NOS NIBThis new old stock, new in box RCA 6BG6G output tube was tested on our Maxi Matcher (with an adapter) with 400 volts on the plates and a bias of 48 volts for shorts, gas and transconductance. There were no shorts or gas. It drew 27. 1 milliamps and had a transconductance reading of 2560 micromhos. (New US made 6BG6s typically test with plate current readings from the mid 20s to mid 50s with transconductance within a standard deviation of 2300

I just cleaned this album on my VPI 16

Their internal structures are all the same

Tube One: 31

new in box Sylvania 17BF11 tube -- and another just like it -- tested to spec on our Paul Hart-calibrated TV7/U

Physical Characteristics:

As a survivor of Communist East Germany

Transconductance was 1900 for Tube One and 1800 for Tube Two where new/nominal is within one standard deviation of 1900

49 and 49 where minimum (65%) is 30 and 100% is 47

I am playing them in my RC-2 monoblocks with The Beatles' "Revolver" and they sound terrific

This new old stock-testing RCA clear top 6CG7 / 6FQ7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

This trio of Toshiba output tubes was tested on our Maxi-Matcher in Real World Conditions with 400 volts on the plates and a bias of -36 volts for shorts

new in box US-made 12J8 tubes tested to spec on our Paul Hart-calibrated TV7/U