What is this bulb component?
This is inside a Levell Transistor Decade Oscillator model TG66A. Its about 2/5ths of an inch in diameter and 1.25in long. At first, on seeing the two electrodes, I thought it might be a vintage neon. However, one electrode is about half the length of the other and the longer one has a ring attached at the top. They seem spaced too far apart for a neon lamp. There is also a fine filament attached to both electrodes at the height of the shorter one and terminated on a bead of material stuck to the inside of the glass envelope.
It has just the two connecting wires with yellow sleeves going to it and appears to be marked ITT R54 (or possibly D54). I am thinking that it may have something to do with stabilisation or temperature compensation of the oscillator and might therefore be some type of thermal device, but am curious as to what it actually is and was hoping someone might have some specification data on it?
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