2. amps-preamps
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Pass Labs heatsinks temperature

Hi all

I have Pass Labs xa60.5 monoblocks and they are always warm to the touch at the heatsinks and not as hot as other class A amps I'm familiar with. A friend from the US that has the same model visited my place and told me his amps ran very much hotter than mine. I got concerned and looked at the manual where temperature was estimated at 55 degrees Celsius. I estimate mine at around 40 Degrees. I'm concerned my amps are not biased to pure class A as they should be. I contacted Pass and while they repeated that heat should be around 55 deg. they had no idea if my concerns are valid and they sounded quite mysterious about it. Did anyone has a xa.5 series model ever measured its temperature or has an idea what can I measure without opening the amps (with a technician) that will prove that they are working only in pure class A ?
Thanks in advance
icorem
jdoris
972 posts
 
Thanks for the measurement, Johngp. That's about 20 degrees above normal body temperature, which I'd expect to be experienced as pretty warm to the touch, but far from jerk your hand away hot. That's about what I feel on my INT-30A. I lust after your 100s, of course, though I'm loving the simplicity of an integrated.

John
icorem OP
149 posts
 
Johngp

Thanks for your input. I think that the front left part of each amp between the heatsinks is the warmest point. Was it there where you got the 120 degrees read ?
vladimir
346 posts
 
If I were you I wouldn't worry. Pass Class-A amps get less warm than most others.
rtn1
535 posts
 
Mine measure 150-152 degrees at the heatsink midway down its length. After 6 seconds, a touch definitely becomes quite uncomfortable. It is the same between the 2 amps. The heatsinks at the front and back are around 140 degrees.
jdoris
972 posts
 
Your 200.5s are a lot more amp than some being discussed here, Rtn. Could that be a factor in heat output?

John
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