Didn't Know this about resistors

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Didn't Know this about resistors

Post by Resistance is Futile on Sat Feb 21, 2009 4:57 am

If you find a resistor with an extra wide first band, it designates that its a wirewound resistor not a carbon, Found the info in Mallory Yaxleys 1937 book.
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Re: Didn't Know this about resistors

Post by tube radio on Sat Feb 21, 2009 10:11 am

I didn't know it either thanks. bounce bounce bounce bounce

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Re: Didn't Know this about resistors

Post by Terrible Terry on Sat Feb 21, 2009 4:42 pm

Well I'll be durned. In all my years of puttering around this stuff I never read that. I looked in my junk box of old resistors but I don't have one. I was gonna crack it open to verify. I'm sure I've seen them with irregular width bands though and just dismissed it as having no significance. Gee whiz, I feel so enlightened now! Very Happy

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Re: Didn't Know this about resistors

Post by FM Refugee on Sat Feb 21, 2009 11:12 pm

...and that has the case in more recent years, too. Even more modern (70s or so) wirewound resistors had the wide first band...
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Re: Didn't Know this about resistors

Post by Timaaay! on Sun Feb 22, 2009 6:14 am

I never knew that either. Thanks for the heads-up.
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Re: Didn't Know this about resistors

Post by exray on Sun Feb 22, 2009 10:03 am

Another resistor tip - those carbon comps that are black as a base color as opposed to brown are NON-INSULATED. Remember that when touching for heat or placing next to other components.
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Re: Didn't Know this about resistors

Post by Terrible Terry on Sun Feb 22, 2009 1:07 pm

? I have trouble making sense of that, exray. If you mean insulated heat-wise, what would be the point of that? Trying to contain heat within a resistor would surely just result in heat build up within the resistor. If you mean insulated electrically, how could you have an effective resistor when the outer package is conductive?

Maybe it has to do with the dielectric of the material, giving a higher breakdown voltage rating to some?

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Re: Didn't Know this about resistors

Post by butch on Sun Feb 22, 2009 1:18 pm

how could you have an effective resistor when the outer package is conductive?
it would work fine if as bill said it isn't touching something else that is conductive.butch

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Re: Didn't Know this about resistors

Post by Terrible Terry on Sun Feb 22, 2009 1:24 pm

Wouldn't the current just flow through the conductive covering instead of through the resistive element? Or does this mean that there is NO outer covering and that the body IS the resistive element? Could be, I suuppose.

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Re: Didn't Know this about resistors

Post by exray on Sun Feb 22, 2009 1:35 pm

Or does this mean that there is NO outer covering and that the body IS the resistive element? Could be, I suuppose.


I guess what you see on the outside is the actual carbon element, smooth molded with the normal color bands.
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Re: Didn't Know this about resistors

Post by Guest on Sun Feb 22, 2009 4:43 pm

I learn something new every day on these antique radio message boards.

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Re: Didn't Know this about resistors

Post by Sinatra1982 on Tue Nov 15, 2016 1:12 am

How can you tell that it is an extra first band?

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Re: Didn't Know this about resistors

Post by Conelrad on Tue Nov 15, 2016 1:59 am

Not extra, but extra wide...

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