Does anyone know the power rating of vintage dog bone resistors?

tom1356 · 12th January 2007, 06:33 PM

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

Jonathan Bright · 12th January 2007, 06:48 PM

How many have you got? I mean if you have sufficient of them is "testing to destruction" an option?

tom1356 · 12th January 2007, 06:53 PM

I have a couple of hundred.
How do I go about testing?

BWRX · 12th January 2007, 07:11 PM

You need Ohm's law and a variable voltage power supply.

Netlist · 12th January 2007, 07:28 PM

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

12th January 2007, 06:48 PM	#2
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	How many have you got? I mean if you have sufficient of them is "testing to destruction" an option? __________________ "It was the Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse.

12th January 2007, 06:53 PM	#3
tom1356 diyAudio Member Join Date: Mar 2002 Location: boston	I have a couple of hundred. How do I go about testing? __________________ My "cult-like" following is accepting applications.

12th January 2007, 07:11 PM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	You need Ohm's law and a variable voltage power supply. __________________ Brian

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12th January 2007, 07:28 PM	#5
Netlist diyAudio Moderator Join Date: Jan 2003	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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