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crwdns2934241:0crwdne2934241:0 Jerry Wheeler

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That would be a thermistor; basically a resistor whose value changes based on temperature, used to regulate the heat output. Here's a page from DigiKey showing the wide variety of values available.

[link|https://www.digikey.com/en/ptm/a/amphenol-advanced-sensors/glass-encapsulated-diode|Glass Encapsulated Diode - Amphenol|new_window=true]

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open