(this is the last of my unknown components).
It is less than 1 cm (half inch) diameter, has one wire on each end.
It has description:
CNR C8G 75L RU G12
The RU is written reversed.
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asked Aug 27, 2017 at 14:44
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4\$\begingroup\$ Looks like a spark gap to me. \$\endgroup\$– Wouter van OoijenAug 27, 2017 at 14:47
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\$\begingroup\$ Thanks ... I think this components comes from an old Philips CRT \$\endgroup\$– Michel KeijzersAug 27, 2017 at 14:50
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1\$\begingroup\$ might be a varistor. Check where it came from – if it's from a degaussing coil circuit, almost certainly a varistor. \$\endgroup\$– Marcus MüllerAug 27, 2017 at 15:03
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1\$\begingroup\$ Looks like a 75 volt gas discharge tube. \$\endgroup\$– Mike WatersAug 27, 2017 at 15:36
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1 Answer
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It's a GDT
What you're looking at is almost certainly a Gas Discharge Tube, or GDT for short. They are basically a spark gap inside a sealed chamber filled with a specific inert gas mixture -- this allows them to provide more precise protection than an air spark gap. They're used for the same things as spark gaps, though -- mostly, overvoltage protection as when they break over and start conducting, they will "crowbar" the overvoltage.
answered Aug 27, 2017 at 15:25
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1\$\begingroup\$ It is, definitely. CNR makes GDTs, and the PDF I just found (but couldn't copy the link on this tablet) shows TV applications. If it's 75 volts, it may be slightly radioactive. \$\endgroup\$ Aug 27, 2017 at 15:48
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