A surge protector is entirely possible. I may have been thinking of something else. However, cold cathode rectifiers are a fact.surge protector? /telephone lines/
not sure if is possible to have gas rectifier without hot cathode, electrodes look pretty same
However, cold cathode rectifiers are a fact.
1940's and early 50's car radios used an 0Z4. Most were in metal cans for shielding, but some glass ones exist. I have several. There are three round metal cylinders, one cathode, two plates. They don't look like this, and they are octal. Purple glow when powered though.
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