2. amps-preamps
  3. 1330029503

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

Showing 2 responses by onemug

onemug
784 posts
 
Couple of questions:

On your front meters, where do the needles sit when the amps are idling?

Do they bounce around much when you are playing music?
onemug
784 posts
 
Icorem,
Judging from your report, it "looks" like your amps are okay. The fact that they aren't bouncing means you are not leaving class A.

Seems like I remember my manuals saying the heatsinks should be "around" 50 degrees "F" above the ambient temp. Don't know what that converts to in "C". My heatsinks run a little hotter in the summer than in the winter. What is your room temp these days?
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