:Please refer to Rider 6-9 G.E. model 63. 6F6 & 6C5 tubes, right side of tube circle on schematic a "DOT" running to ground, what are the people at G.E. telling me back in 1935??
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Both of these tubes are of the metal envelope variety. I believe you will find the dot to ground is referring to pin 1 of the tube, which is the metal envelope.