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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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15th May 2018, 7:59 pm | #1 |
Pentode
Join Date: Feb 2015
Location: Conwy, Clwyd, UK.
Posts: 246
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Flame proof resistors
Hello folks.
Some time ago i bought some flame proof resistors when they were clearing some values cheaply from Rapid. It might be coincidence but two have failed open circuit within a few months, and all of a sudden I’m wondering if there might be more to flame proof resistors than just a special coating. Datasheet doesn’t seem to suggest there is anything different about them, so perhaps i’ve just been unlucky. It seems unusual to have resistors fail OC, but i could be wrong. Glyn |
15th May 2018, 9:34 pm | #2 |
Octode
Join Date: Oct 2003
Location: Newbury, Berkshire, UK.
Posts: 1,770
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Re: Flame proof resistors
If they are those square ceramic ones, I’ve seen them denoted at "safety components" on some circuits - usually used in series with mains / HT feeds. It maybe that some types are designed to fail open as fusing protection.
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Chris |
15th May 2018, 11:19 pm | #3 |
Pentode
Join Date: Feb 2015
Location: Conwy, Clwyd, UK.
Posts: 246
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Re: Flame proof resistors
Hi Chris, no these look like standard 1W resistors. I think I’ll heat one up with a hot air gun and see how it behaves.
Glyn |
15th May 2018, 11:36 pm | #4 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,192
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Re: Flame proof resistors
I invariably use 2W flameproof resistors as replacements in valve gear and I've never known one to go o/c.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |