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165R4Sensibly equivalent¶ to:165R4G
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The 165R4 is a ballast tube or baretter. The resistance wire runs from pin 1 to pin 4 with a tap connected to pin 3. The tube is designed to drop 49 Volts at 300 mA. The dissipation is 14.7 Watts. ![](../pics/aaq0346a.jpg)
The helical wound wire is mounted between notched mica supports.![](../pics/aaq0346b.jpg)
A close-up of the winding.The classic envelope is 38 mm in diameter, and excluding the base UX4 pins is 87 mm tall.Reference: 3002. Type 165R4 was first introduced in 1935. See also 1935 adverts. |
Updated January 06, 2015.
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