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Old 12th January 2007, 06:33 PM   #1
tom1356 is offline tom1356  United States
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Default Does anyone know the power rating of vintage dog bone resistors?

Does anyone know the power rating of vintage dog bone resistors?
I have three different sizes. They are shown with modern 1/4 watt and 1/2 watt resistors for size comparison.
Thanks
Tom
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Old 12th January 2007, 06:48 PM   #2
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How many have you got? I mean if you have sufficient of them is "testing to destruction" an option?
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Old 12th January 2007, 06:53 PM   #3
tom1356 is offline tom1356  United States
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I have a couple of hundred.
How do I go about testing?
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Old 12th January 2007, 07:11 PM   #4
BWRX is offline BWRX  United States
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You need Ohm's law and a variable voltage power supply.
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Old 12th January 2007, 07:28 PM   #5
Netlist is offline Netlist  Belgium
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Body color: first number
Color on the side: Second number
Dot on body: multiplier
Color code is the same as for modern resistors.
Example:
Body red: 2
Color on the side green: 5
Dot on body yellow: 10k
R= 250K
Don't look for tolerances, they didn't exist in those days.

Funny - not scientifically correct - note:
It is possible to determinate the age of these resistors.
They double in value every 60 to 70 year.
Example:
A 250k will read +/-500k after that period.

Edit: not power rating but might be helpful anyway.

/Hugo
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