My prior post is intended to isolate the problem. The tubes, themselves, maybe defective. Follow the rule of KISS (Keep It Simple Stupid). If you try to test them, in a complex circuit, you can't determine what is at fault. Too many variables. Divide-and-conquer. That's why you need just the tube, one resistor, and the power supply. See what you get, before proceeding. At least we can establish if the tubes are good, or not. As it stands, we don't know if the tubes are bad, or the circuit is not functioning as intended, or another component is defective. With a simple circuit, we eliminate as many variables as possible.
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