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Old 8th January 2013, 07:08 AM   #1
Dagwood is offline Dagwood  New Zealand
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Default Does anyone know what this is!..???

Hi

Found this in a mixed box, no markings, 4 pins, no idea !!

http://i1155.photobucket.com/albums/...2/IMAG0641.jpg
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Last edited by Dagwood; 8th January 2013 at 07:10 AM. Reason: No photo
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Old 8th January 2013, 07:10 AM   #2
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http://i1155.photobucket.com/albums/...2/IMAG0641.jpg
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Old 8th January 2013, 07:14 AM   #3
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Its a ballast tube , a resistor in a tubes envelope .
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Old 8th January 2013, 08:03 AM   #4
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a test dummy for production?
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Old 8th January 2013, 01:34 PM   #5
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Quote:
Its a ballast tube , a resistor in a tubes envelope .
It is a ballast tube, which is not a pure resistor. It is a tungsten heater with similar characteristics to the heaters in the tubes it was designed to work with. Old radios often had their heaters wired in series and connected to a power source. This was often the line voltage, but could be 28 or 48 volts in aircraft or marine systems. A ballast tube was added to absorb the difference between the source voltage and the sum of all heater voltages. Obviously each application requires a tailor made ballast tube.
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Old 8th January 2013, 04:18 PM   #6
Dagwood is offline Dagwood  New Zealand
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Thanks guys.....display tube I think they call them on Ebay
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Old 8th January 2013, 08:03 PM   #7
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Could be iron-hydrogen resistor.
In that case it has an iron filament (not tungsten) and the gas inside is hydrogen.
Iron-hydrogen resistor - Wikipedia, the free encyclopedia
works like a constant current device - sort of - when connected in series
iron has a much lower melting point than tungsten, when it glows slightly red it is already close to melting; don't apply voltage unless you want to distroy the filament
they were not glowing during normal operation !
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