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 Post subject: VRM temp
PostPosted: Sun Jul 28, 2019 4:22 pm 
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Joined: Sun Jul 28, 2019 4:02 pm
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Hey y'all! First post from a Trinity amp fan and my first build (5e3 kit). Build went off without a hitch and the amp sounds incredible. I do have one question though. I opted to install VRM kit at the time of build, and everything seems to be working properly. All voltages are within 10% of what they should be, and I get a voltage change when adjusting VRM. However, when running the VRM at about 50% or so, the MOSFET gets so hot you can't touch it (think of how hot a power tube gets). I haven't actually measured the temp, but I will if need be.

I have the MOSFET installed on the side of the chassis according to the diagram. Like I said, the amp works perfectly, but I just wanted to know if this heat is normal. I've played it maybe 45 minutes continuously at the longest at somewhat bedroom volume.

Thanks for all your help everyone!


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 Post subject: Re: VRM temp
PostPosted: Sat Aug 17, 2019 3:37 pm 
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Holy Ghost
Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7350
Location: Brighton, Canada
the MOSFET is acting like a big resistor so at low levels it gets hot. The only way to cool it down more, is to add a second heat-sink on the outside.
That would not be a bad thing but over time, there have been very few MOSFET failures due to heat.

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