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In Reply to: RE: Very sound advice. posted by Mike K on September 15, 2020 at 11:37:00
possibly OK to try only if you are replacing it with another heatsink.
The cover IS the heatsink. Amp should never be on without the cover.
Apologies in advance if you already knew this and I just misread your post!
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Follow Ups:
Even if the top cover is the heat sink, does it not also act to keep
heat inside the case? And if this is the situation, would not removing the
top cover/heat sink allow more heat to escape, thus obviating the need
for additional cooling? Or am I missing something?
Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed. - Albert Einstein
Air alone would not dissipate the high heat from the output transistors in this class "A" design. You need heatsinks.
The transistors are mounted on a (aluminum?) bar. The bar is coupled to the cover with thermal paste. The cover is ribbed to work as a large heatsink.
If the cover is hot it is working properly.
Remove the cover, the transistors will overheat.
Musical Fidelity did this interesting design to maintain a modern slim look.The alternative would be to have a taller cover drilled for ventilation. And then large internal heatsinks for the transistors.
Hope this makes sense.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
for using the top cover as a heat sink. I think.
I'm not an engineer, and my understanding of physics is rather limited
(to say the least!), so I defer to those who are more knowledgeable in
these matters, such as yourself.
Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed. - Albert Einstein
I'm no technical expert either. Sometimes I feel comfortable commenting only because of trial and error experiences.
In this instance, besides my own experiences with heat sinks, I related to the many super (gaming) computers my two sons have built over the years with heatsinks, fans, and water cooling systems. In their case it was for processor chips vs output transistors.
So much crossover technology out there!
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
I have the 2008 A1 version anyway, I understand it is quite different eletrically than the original A1.
this is a good photo (not mine)
sex after 70 is like trying to play pool with a rope
My understanding is that all the A1 models use the ribbed cover as a heat sink. It is coupled with thermal paste to a metal (aluminum?) bar inside. The output transitors are mounted on the bar.
The heatsink cover is working properly when running hot. It is drawing heat away from the bar/output transistors.
The fact that the temperature has remained consistent all these years is a good sign that the integrity of the thermal coupling is intact. In fact a "cold" cover would indicate an internal issue.
The fan you bought will help the cover dissipate the heat faster and allow the temp to drop to the touch and internally.
Excellent fan suggestion by Duster in that it can work vertically.
Overall good idea to cool things down to prolong the life of your amp.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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