Resistor sizes

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Resistor sizes

Post by Rickey on Sat Oct 22, 2011 7:47 am

I ordered some resistors from Mouser, and some of the resistors say 1 watt on the package, but they are only half as big. Did I get half watts by mistake? They are metal film.
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Re: Resistor sizes

Post by Bill Cahill on Sat Oct 22, 2011 9:59 am

The new resistors tend to be smaller in size than original old ones.
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Re: Resistor sizes

Post by jukeboxman on Fri Nov 04, 2011 10:53 pm

I agree I just got a bunch of half watt carbon film and was shocked at how small they were.
Gary
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Re: Resistor sizes

Post by sprman on Sat Nov 05, 2011 4:11 pm

Now days they are much better made even tho they are smaller.Caps are same way.Tho better and smaller i wonder if they get rid of heat beter..Sprman : )

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Re: Resistor sizes

Post by Fred Longworth on Tue Mar 20, 2012 1:43 am

I think the tinier metal films are simply capable of running a lot hotter without degradation.

They also have a really good noise figure. I order from Mouser at least once a week.

Fred
owner of Classic Audio Repair in San Diego

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Re: Resistor sizes

Post by Leigh on Tue Oct 09, 2012 6:10 am

Fred Longworth wrote:I think the tinier metal films are simply capable of running a lot hotter without degradation.
Exactly. Resistor power ratings are based on the highest temperature the part can stand without problems.
Modern parts can take higher temperatures.

On the subject of ratings, be aware that resistors have voltage ratings, just like capacitors.

Regular 1/4-watt carbon composition resistors are rated 250 volts, and thus are questionable for use in tube radios.
Standard 1/2-watt carbon comps are rated 350 volts, while 1-watt and 2-watt parts are rated 450 volts.
Be sure to choose replacement parts with an appropriate voltage ratings. I only stock 1-watt or 2-watt parts.

- Leigh

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