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Old 16th January 2013, 03:24 PM   #1071
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You can set bias post at about 3.5V and be safe to attach output fets. This will get you close to turn on voltage and allow less turning to achieve final bias. If you have FE boasting correctly, there is little you can do at this point to hurt the build. Before firing up check isolation of fets with MM set on Resistance setting, touch drain of get and sink at same time. It is the only thing left you could do wrong
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Old 16th January 2013, 03:29 PM   #1072
Marra is online now Marra  United Kingdom
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Thanks Buzz.I've a way to go yet but pcb's are part populated and heatsinks drilled and tapped;I've just to decide on one or two chassis i.e seperate power supply casing.
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Old 16th January 2013, 03:32 PM   #1073
PKI is offline PKI  United States
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Guys, is this a good sink for MUR3020W? 657-15ABP Wakefield | Mouser
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Old 16th January 2013, 03:34 PM   #1074
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by buzzforb View Post
You can set bias post at about 3.5V and be safe to attach output fets. This will get you close to turn on voltage and allow less turning to achieve final bias. If you have FE boasting correctly, there is little you can do at this point to hurt the build. Before firing up check isolation of fets with MM set on Resistance setting, touch drain of get and sink at same time. It is the only thing left you could do wrong
Cmon Buzz ,

Time to finish your best one yet , the 4pr is calling ...
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Old 16th January 2013, 04:06 PM   #1075
Renron is offline Renron  United States
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PKI,
I have those sinks on my regulator diodes. They work well. make sure the enclosure has vent holes for fresh cool air. Keep them electrically isolated, then you don't have to use silpads or mica or whatever......
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Old 16th January 2013, 04:31 PM   #1076
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Cmon Buzz ,

Time to finish your best one yet , the 4pr is calling ...
AudioSan was suppose to take the heat off me. Gotta finish Salas SMD RIAA for brother this weekend. Guess i got to beat that damn F5TV3 bug after all.
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Old 16th January 2013, 04:43 PM   #1077
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hehe. i'm a little stuck at the moment damn that M3 tap. and alu.
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Old 16th January 2013, 05:18 PM   #1078
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I enlarge my fet holes, as an M3 tap is impractical IMO.
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Old 16th January 2013, 05:25 PM   #1079
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vel. M3 is practical over here
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Old 16th January 2013, 06:06 PM   #1080
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Its not about availability, but size. I would go with m5. Take necessary bolt/screw, put in fet hole, use speed of hand drill to reem out.Got perfect size hole and stronger bolt/screw.
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