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Re: [TCML] RE: Primary coil supports

I've use white ABS for MMC's but for none of the reasons mentioned. That's a mechanical/electrical reason. Wood if arced to will generate carbon. The more often this occurs, eventually a nice black thick carbon track will end the coils usage until dealt with. But, sealing and "insulating" from the wood will prevent it. I've also had carbon tracks occur in even G10. So it's not only wood. Anything can develop a carbon track if the voltage is high enough for the material and distance (and those carbon tracks all look the same = black, and cause the same problem = a short).

Take care,

Troy Peterson wrote:
I've used wooden primary supports on my coils with a good measure of success... Without any sort of sealent either... however, as I believe was recently mentioned, at a high enough voltage EVERYTHING becomes conductive.... At the voltage levels used in our primary circuits wood will conduct a small amount of current. there is probably some inductive losses in it too.. Plastic will essentially be lossless. All in all, I doubt the losses from using wood would be significant - and if you ensure that its dry and well sealed then it should perform every bit as well as a plastic coil form.

As for MMC construction - I think the main reason that most people use plastic rather than perf board is that it just looks nicer. And the holes on most standard perf board may not be big enough to accept the mmc cap leads without some help. Also, perfboard is really flimsy and will buckle under the weight of a load of MMC caps without good support... But there's no reason that it can't be used.

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