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Old 14th April 2009, 02:13 PM   #11
diyAudio Member
 
Join Date: Jan 2003
Location: Sweden
A 25W Dale is specified for up to 9W without any external heatsink at an ambient temperature of 25C. The surface temperature will then be very high but according to specifications it can safely be as high as 200C. The resistor value will stay inside the tolerance specified which is typically 100ppm/C so even if the resistor increase its temperature 150C the resistor value doesn't change more than 1.5%.

So as long as your ambient temperature doesn't go up much more than 25C you should be alright, (almost even without a heatsink).

Regards Hans

As many others say life time is very dependant on heat, a rule of thumb is that life time reduce by a factor of 2 for every 8 - 10C temperature increase.
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