4 RCA 6BG6 6BG6G Vacuum Tubes Shoulder ST-Shape Triple 3 Mica Lot Of Four 6EH5 Septal T13 Both tubes were made in

Both tubes were made in the same factory just as RCA bought out Cunningham

Date Codes: none visible

new in box GE 6EM5 tube tested to spec on our Paul Hart-calibrated TV7/U

(New / nominal transconductance is within one standard deviation of 1900

I just cleaned this two (of three) record LP set on my VPI 16

4 RCA 6BG6 6BG6G Vacuum Tubes Shoulder ST-Shape Triple 3 Mica Lot Of Four 6EH5 Septal T13 Both tubes were made inThis lot of four RCA triple mica 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 2020 micromhos for Tube One and 1630 for Tube Two. Tubes Three and Four measured 2260 and 2380, respectively. Plate current draw was 15. 6, 17. 3, 19. 4 and 27. 7 milliamps, respectively. (New 6BG6s typically test with plate