Affectionately known as a "pawn broker's tube" because of the three balls, it is a type of cold cathode rectifier. The actual number eludes me right now.
surge protector? /telephone lines/
not sure if is possible to have gas rectifier without hot cathode, electrodes look pretty same
not sure if is possible to have gas rectifier without hot cathode, electrodes look pretty same
A surge protector is entirely possible. I may have been thinking of something else. 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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