Finally found both product numbers:
Thermalcote™: 250G Thermalcote is a superior silicone-based thermal joint compound uniquely developed to increase heat transfer to all heat sinks. Thermalcote’s thermal conductivity is more than 15 times that of air and more than 4 times the conductivity of typical silicone-based greases. It is non-toxic and extremely stable; it neither cakes nor runs between -40°C to 204°C. 250G is a 57 gram (2 oz.) tube of Thermalcote. Representative image only.
The WAKEFIELD part 120-2 is a highly efficient thermal management solution designed to ensure optimum heat dissipation in electronic systems. This temperature-resistant thermal grease boasts excellent thermal conductivity, with a 56°C/W thermal resistance and a thermal conductivity of 0.735W/m.K. Its opaque white composition allows for easy visibility during application, ensuring precise and uniform distribution of the grease. The thermal grease is supplied in a convenient jar, making it easy to access and apply.With a high electrical resistance of 5X10e14 Ohm.cm, this thermal grease provides excellent electrical insulation properties, ensuring the safety and reliability of your electronic components.Whether you're working on a DIY project or maintaining professional electronic systems, the WAKEFIELD part 120-2 is the ideal thermal management solution to keep your devices cool and running efficiently.
Looks like what I used, Thermalcote and what I intend to use are both conductive.
Thermalcote™: 250G Thermalcote is a superior silicone-based thermal joint compound uniquely developed to increase heat transfer to all heat sinks. Thermalcote’s thermal conductivity is more than 15 times that of air and more than 4 times the conductivity of typical silicone-based greases. It is non-toxic and extremely stable; it neither cakes nor runs between -40°C to 204°C. 250G is a 57 gram (2 oz.) tube of Thermalcote. Representative image only.
The WAKEFIELD part 120-2 is a highly efficient thermal management solution designed to ensure optimum heat dissipation in electronic systems. This temperature-resistant thermal grease boasts excellent thermal conductivity, with a 56°C/W thermal resistance and a thermal conductivity of 0.735W/m.K. Its opaque white composition allows for easy visibility during application, ensuring precise and uniform distribution of the grease. The thermal grease is supplied in a convenient jar, making it easy to access and apply.With a high electrical resistance of 5X10e14 Ohm.cm, this thermal grease provides excellent electrical insulation properties, ensuring the safety and reliability of your electronic components.Whether you're working on a DIY project or maintaining professional electronic systems, the WAKEFIELD part 120-2 is the ideal thermal management solution to keep your devices cool and running efficiently.
Looks like what I used, Thermalcote and what I intend to use are both conductive.
You don't need to lather on thermal pastes. Just enough to spread thinly and fill the microscopic imperfections between the two surfaces to which its being applied. Too much eventually becomes inefficient.
Just dip a fine paintbrush into the thermal paste then spread it very thinly just enough to cover the surface (just) if it oozes out to much after you tighten the m3 screws you've used to much
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If it were the fuses that were the issue, you wouldn't have lost 2x outputs, you'd have just lost a fuse. The fuse did its job, the Cobra (hopefully), with its fast protection, should have saved anything else.
@Ponti17. If you zip up the 3D files (STL, 3MF, CAD file, etc...) you can post them in the thread directly for easy download. Always fun to see custom 3D print designs used in diyaudio.
Nice work and thanks for sharing!
Just confirming I will use slow blow fuses as listed in the BOM. Thanks.
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mainframe, somehow I remember reading this and what really stuck with me was "burr." Glad I remembered. This is exactly what my experience was that also resulted in crashing bias and 2 transistors and 4 resistors getting blown.
When I run my finger over the holes for the output transistors, I can feel the edge of each hole. When I do the same with holes I haven't screwed into, they are smooth. I assume that is what I want. Any suggestions of what to use to file down or smooth out the edges that I feel?
Thanks for taking the time to report the above. I know I've benefitted, and others will too.
Just take a larger drill bit - say 6 to 7mm or 1/4Inch and put it in the hole you made and spin it with your fingers with a bit of force a few times. If you don’t have the grip strength for this you can do it with a cordless drill, just with very little pressure on the drill instead. The larger drill bits taper will nicely cut the top edge or “file” the hole in a nice circle. Daniel’s videos show this somewhere also…
You must always do this with heatsink applications. I missed it on the one hole only and paid the price.
You must always do this with heatsink applications. I missed it on the one hole only and paid the price.
Just adding more to this while we on the topic - If you're use a cutting compound to assist with the drilling or tapping holes (you usually shouldn't need to with aluminum as its soft), this should be cleaned out of the holes otherwise when the transistors are screwed down it will ooze up and get in-between your pad and heatsink and really degrade thermal transfer.
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