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Old 2nd November 2012, 12:50 PM   #1871
Salas is offline Salas  Greece
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It must be having quite some coupling capacitors.
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Old 2nd November 2012, 02:16 PM   #1872
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Jupiters - must be something in the beeswax!
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Old 2nd November 2012, 02:40 PM   #1873
Salas is offline Salas  Greece
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This type? I measured enough dissipation VS MKP but subjectively they were high class.
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Old 2nd November 2012, 03:36 PM   #1874
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That's the brand, yes, but the type I have is now out of production - they have the orange case. I can post a pic when I get home. I must say I haven't listened to the DCB1 a whole lot, because I don't have adequate heat sinks yet and I don't want to toast any more mosfets! My favorite configuration so far runs about 300ma and uses super through power caps and AMRG resistors. I also must state that I've only run trial setups with a cheesy radio shack transformer with the DCB1, and I use a large toroid with the standard B1 - the transformer makes a difference, I think.
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Old 2nd November 2012, 03:51 PM   #1875
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They look like these, but bigger since they're 10uF: Click the image to open in full size.
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Old 2nd November 2012, 03:56 PM   #1876
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They look like having the previous outer wrap? Keep them away from shunt's sinks...
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Old 2nd November 2012, 05:24 PM   #1877
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They're far enough away - they sit on the case, and even when I had the mosfets bolted to the case they didn't get warm (bolting to the case wasn't good enough - the mosfets failed!). I've put a small fan in too.
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Old 2nd November 2012, 05:31 PM   #1878
Salas is offline Salas  Greece
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Surely they had full back on contact?
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Old 2nd November 2012, 06:20 PM   #1879
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Electric insulators between mosFETs and their heatsinks.

Anodised aluminium is an electric insulator, but it is very thin and could fail soon after fitting.
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Old 2nd November 2012, 07:16 PM   #1880
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Yeah, they were smeared with heat sink compound and were insulated with mica. The case had a light colored powder coat, though, so I don't think it was a very efficient heat radiator. It did get hot for about two inches around the mosfets. The mosfet cases got to 60 though, which, as I now know, is good for a month or two of operation! They probably got hotter when I put the cover on the case. So then I tried individual heat sinks, but they weren't big enough and the mosfets got even hotter. So now I'm waiting for half bricks from Mouser - hopefully they will do the trick, in conjunction with the fan. My case is kind of cramped (an old Comcast cable TV box) so finding sinks that would fit in it was kind of tricky, since it's only 2.5 in high or so.
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