4 RCA 6BG6 6BG6G Vacuum Tubes Shoulder ST-Shape Triple 3 Mica Lot Of Four 6EH5 Septal T13 The diodes measured 78 and

The diodes measured 78 and 74

Two have MISSING CENTERING PINS

This matched pair of Sylvania 6F6G tubes was tested on our Maxi-Matcher 325 volts on the plates and a bias of -36 volts for shorts

Date Codes: none visible

4 RCA 6BG6 6BG6G Vacuum Tubes Shoulder ST-Shape Triple 3 Mica Lot Of Four 6EH5 Septal T13 The diodes measured 78 andThis 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