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Not all zener diodes are directly used as supply regulators. Some are supplied a low current and used as voltage reference devices ie a they have a fixed voltage drop across them when fed a small current from a resistor connected to a larger not so fixed voltage, and there is a good chance that is how TVcollector's set uses that neon bulb.
Look for the classic 6AS7 (the 6AS7 is not a gas regulator) regulator circuit. It uses a gas regulator as a voltage reference for a 12AX7 comparator which then drives the 6AS7.
I guess I need to not pick tube numbers (that I'm not used to working with) out of memory...
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