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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
elberoth2's avatar
elberoth2
1,223 posts
 
Get yourself two multimeters and bias it by yourself. On the scale form 1 to 10, I would rate it as 2 - easy DIY project. 15 minutes and you are done (then you will have to recheck in 1h or so).
icorem OP
149 posts
 
Elberoth2

I'm not a DIY guy - I hardly know what the word bias means :-)
Just wanna make sure that what I have is what I paid for my hard earned money. Thanks anyway
mechans
3,048 posts
 
I guess I am begging the obvious, when I say take it to a tech who can talk to pass about the bias current spec, and have him make the adjustment. I assume there is no dedicated Pass service center you can get it to easily.
hgeifman
2,300 posts
 
I suggest you call Pass Labs again and ask them how you can check to see if the amps are biased to pure class A as they should be. I am also not a DIY person so I suggest you take the amps to a local technician and request the amps bias be checked. Pass Labs should be able to explain how to do this (I hope).

You have to ask Pass Labs if the amps are not bias correctly, can the local technician set them correctly or do they need to be returned to the factory.

Do you have a local Pass Labs retailer who can help. A local Pass Labs retailer might be the best option.
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