That, combined with the convenience of having no mess with silpads (especially in cases where you may need to replace transistors more frequently, e.g., on a 6100) is why I recommend silpads over grease for vector monitors. But I also don't believe 10-year old grease will be, and the silpad will be more stable over the long run (as they were for AR's, where Atari used silpads for the 2N3055's, and those get hotter than monitor bottlecaps, by about 30 degrees.) I'll accept that fresh grease might be better than a silpad right out of the tube (though I have never measured by how much). I actually measure them now, and I get around 100F for the lower aluminum plate, and 80F for the side plate, with silpads. My first experience with this was when I redid my first 6100, and noticed how much warmer the frame got afterwards, once the heat was being better conducted to the frame. I am not aware of an instance for arcade use where the thermal resistance of a silpad is insufficient, and the lower resistance of a mica + grease is absolutely necessary. I'm talking about the difference between old dried grease, and fresh grease or a silpad (which I contend are both better than dried grease). St 2n3055 To-3 Npn Silicon Power Transistors. And yes, use a very thin layer of grease on both sides of the mica pad, because there are small voids on both the transistor and heat sink sides that need to be filled. Easycargo 10 Packs to-3 Heatsink Insulator/Mounting kit (Screw+Washer+Bushing+Insulator), to-3 Heat Sink Insulator Mounting Kit for MOSFET Transistor Voltage Regulator. Of course if you remove the part, you need to clean and replace the grease, because the old grease won't fill all the new voids. Once the part is clamped down with the gaps filled, it doesn't need the carrier anymore. the grease just allows it to initially go into all the small gaps. It doesn't seem like it would, simply because it's the filler (like zinc oxide) that gives it the thermal transfer properties. I agree that the difference is probably only a few degrees C (depending on the power consumption and heat sinking capability), which probably won't make much difference though.ĭo you have any reference showing that dried grease conducts worse than gooey grease? I am genuinely curious, because I've looked in the past, and couldn't find anything. Click to expand.In your own posts, I've seen you say that the difference matters many times, because it is literally the interface that cools the transistor, and cool transistors are the key to long transistor life.
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