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Cooling method for GTP-750

Hi, I just came across this post and I just got a GTP-750 and I too notice that it runs extremely warm when left on for a while. And I am suprised that there are no cooling vents OR a fan used...right now I have the top cover open about a 1/4th of the way just to let some circulation happen.

What do you have for a cooling method and the rectifier info would be appreciated in case I need repair on this unit - mine works great still and I am hoping to not have to go through any repair anytime soon due to overheating!

Please email me at Thanks!

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Well ehy do you not put in 2 fans. 1 on the left and 1 on the right. Make the vents and build it in. You can use the standard size PC cooling fan. Just look for a 12 or 15 V supply and make sure to regulate it with an LA7812 Transistor, Very easy circuit. Will give you one if needed.

Posted on Jun 02, 2008

  • Stuart Slabber Jul 08, 2009

    Hi, there is no big need for all that trouble. Why put in 2 PC fans if you could change you Heat sink. You need to look at the design of the amp and how it was made to run. Then look at your setup and see if this matches. If you are running more speakers or your load is more or less on that particular output then you should remember that you are not running the amp as it intended design.

    You can how ever change the amp to suit your needs.

    To cool it down first change your heat sink. Then ad a single fan on the top or back of the heat sink. make sure that you turn the fan around to create a vacuum. This will draw the hot air out and cool air in. Putting the fan at the back will be better as you will create air flow over and through the heat sink.

    Now: To run the fan yes you need a supply. between 13-18VDC
    Please do not use a LA7812 as this is a negative regulator. Use the LA7912. Make sure you use your power supply earth and NOT the amp's earth as they are 95% of the times Isolated.

    Hope you come right



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