Matched Pair RCA 6BG6 6BG6G Vacuum Tubes Shoulder ST-Shape

Matched Pair RCA 6BG6 6BG6G Vacuum Tubes Shoulder ST-ShapeThis matched pair of RCA 6BG6G output tubes was tested on our Maxi Matcher with 400 volts on the plates and a bias of 48 volts for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 2480 micromhos for Tube One and 2500 for Tube Two. Plate current draw was 25. 1 and 26. 3 milliamps, respectively. (New US made 6BG6s typically test with plate current from the mid 20s to mid 50s with transconductance within a standard

This album is excellent in all regards

5 standard deviations of 4000 micromhos)

These tubes have stout

new in box 12EM6 tubes tested to spec on our Hickok 800

Transconductance measured 67 in Section One and 70 in Section Two for Tube One and 71/72 in Tube Two where minimum (65%) is 50/50 and 100% is 77/77

an engraved base

This new old stock-testing matched quad of Sylvania 7A7 tubes was tested on our Hickok 800 and all measured 1900 micromhos where new/nominal is 2000 and minimum (65%) is 1300

Transconductance measured 20 for Tube One and 22 for Tube Two where minimum (65%) is 16 and 100% is 25

This lot of three US-made 7F7 tubes was tested on our Paul Hart-calibrated TV7/U and measure as follows:

28/27 and 33/26 where minimum (65%) is 18/18

They are slightly microphonic

The Superior-tested tube measured "low to medium-good