MX50SE problem please help

There you go .dimensions are 150mm by 60mm by 25mm
 

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I have some of those! I tried them but found that they weren’t good enough. You need thicker metal so the heat can disperse into the fins better. The black anodized ones also work better than the silver ones. They may work ok with a fan, but I didn’t want to have fans for mine, so I just bought (much) bigger heatsinks. They were something like 3 times the price of those ones and are way heavier.

Better too big than too small.
 
Alright I just did a test with a 8ohm resistor running at 3.4volts ac which is 1.45 watts and the amp gets very hot I can only hold my hand on there for about 6 sec before it starts to hurt but the resistor without a heatsink was warm to the touch !
 

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Yes I'm talking about when amp is used condition or during large proportion current draw transistor heats alot to cure that use bigger heatsink or fan, a well calculated Sziklai config can give better result at heat and gain performance, design matters , but for now use a big heatsink or fan 👍
 
Alright I just did a test with a 8ohm resistor running at 3.4volts ac which is 1.45 watts and the amp gets very hot I can only hold my hand on there for about 6 sec before it starts to hurt but the resistor without a heatsink was warm to the touch !
Bro I m not jocking there is no ventilation, after covering the internal atmosphere wil b too hot , heat dissipation at AIR is very important,