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In Reply to: RE: Supplementary heat sink? posted by LtMandella on September 13, 2020 at 10:44:44
I used to have the A100 version from the 1990's.
I bought it second hand, kept it a week: it was so hot to the touch (including the potentiometers) that it was barely useable.
Then some day while I had my back turned my stupid flatmate put a newspaper on it and I thought the thing was about to melt... fortunately nothing bad happened but that incident made me return the amp and get something less dangerous.
I've had some other classA amps since, but none that would get as silly hot as this MF amp. Far from it. The way they conceived it is flawed for long term reliability IMHO... so yes, you might want to add some heat sinking if you plan on keeping the amp!
Follow Ups:
There are some interesting threads out there on the A1 2008 design.
The DIYers have the parts list and those power transistors are well known for being very musical but very difficult to control thermally.
The DIYers were burning up the transistors right and left trying to make them work biased in class A, without success.
So no one has been able to repeat what MF did with them AFAIK.
sex after 70 is like trying to play pool with a rope
I think you have little to be concerned about since the heat being transferred to the top of the enclosure is a sign that it is an effective heatsink. If the top panel was not hot, that would be a bad sign, since the heat would pose a real problem for the transistors. I expect the Zippi fan will do what you wish by providing cooling of the top panel which is acting like a proper heatsink.
I have a Newmar marine power supply that runs hot enough to burn my fingers when I touch the massive aluminum heatsink, and as a result I'm sure the PSU is not being stressed by the load.
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