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Old 7th May 2013, 04:49 PM   #1
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Default Help identifying vintage resistors wattage rating.

Hello! I'm rebuilding an old amp and I'm having a little trouble identifying the wattage of one of the resistors I need to replace. I know some of you have been around these long enough to quickly identify by photo so I've got one here with a quarter for size reference:

http://i.imgur.com/sF7jKN7.jpg

Anyone have an idea? I'd appreciate any help I could get.
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Old 8th May 2013, 06:10 AM   #2
Stixx is offline Stixx  Germany
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This is quite a hefty looking unit... I'd assume it is rated at 5W but older resistors usually had lower ratings. So to call it safe make it 3W. This one doesn't even look as if it needs to be replaced...
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Old 8th May 2013, 06:28 AM   #3
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How "old" is "old"? That looks like the construction of early metal film or metal foil precision resistors from the 1950's or 60's. Despite their size, power ratings weren't very high so your unit may be only 1/2W or 1W. (Being precision parts it could be that power rating was based more on resistance tempco due to self heating, rather than the power that would cause permanent damage.)

I have to agree with the other comment: Visual appearance doesn't suggest replacement is necessary. Except you may have already clipped the leads too short.

Dale
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