I can not figure what the white colored component labeled "5W3K9J" is. The "3K" part seems to indicate a 3K resistor. Could some one please verify this?
Electronic – Identity of electronics component needed
components
Related Solutions
That's a selenium rectifier. Google "selenium rectifier" and there's loads of info, photos. They've been obsolete since the 1970s. Decades ago, they were cheaper than vacuum tube diodes, and semiconductor diodes couldn't handle higher voltages and currents. The parallel plates are indeed for cooling.
It's a resistive hygrometer (or simply put: a humidity sensor). The resistance across the contacts varies depending on the relative humidity of the air it is suspended in.
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Best Answer
It's a wirewound resistor and the breakdown would be: