Electronics > Beginners
Class A Amplifier Heat Sink Requirements!?
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soldar:

--- Quote from: Benta on March 14, 2019, 07:35:21 pm --- The Nelson Pass A40 is indeed a class A design, and from pictures it has enormous "cooling towers" with fans:
--- End quote ---
I stand corrected. It seems a bit crazy though unless you want it to double as a space heater.
Robbie010:
Pass A40 schematics attached.

I have seen A40 builds with massive heat sinks and other with very similar setups to the one I was planning.
Benta:

--- Quote from: soldar on March 14, 2019, 08:14:51 pm ---
--- Quote from: Benta on March 14, 2019, 07:35:21 pm --- The Nelson Pass A40 is indeed a class A design, and from pictures it has enormous "cooling towers" with fans:
--- End quote ---
I stand corrected. It seems a bit crazy though unless you want it to double as a space heater.

--- End quote ---

No, you don't stand corrected :)
I've now read the Nelson Pass article on the A40, and I conclude that it's a high quiescent current class AB amplifier. He presents some waffle about "push-pull class A", which is nonsense in this context.

A pure 40 W class A will dissipate at least 210 W per channel, 250 W is more likely.

soldar:
Yes, I took a quick look and saw the topology with complementary pair and assumed it was just another of the many of this type. I can't see much benefit to raising the quiescent current like that but it can be done in any of that topology, including the one I posted further up. Maybe someone will say it reduces distortion somewhat to which I would ask if it is noticeable and if it is worth it. Especially because if you want to increase quality the first thing I would do is get a regulated power supply.
Refrigerator:

--- Quote from: Benta on March 14, 2019, 09:21:07 pm ---A pure 40 W class A will dissipate at least 210 W per channel, 250 W is more likely.

--- End quote ---
Surely it produces "warmer" music :-DD
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