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Post by rocinante on Jun 6, 2015 22:04:18 GMT -6
So I purchased an antek 05t240 (which is a 50va toroidal with 240v x 2 @250ma and 6.3v x 2 @3a filaments) for a dual channel tube eq I had built in a 1u size case. I'm using two of 6.3v lines for heaters for two tubes and the 250v for my ht. The eq is finished, does wonders and everything fits just perfectly. Everything but the toroidal which is a couple of hairs (or just 2 mm to tall). My question is If i install rubber around it and use a rubber pad on top (using plastic ties to mount it) would it cause over heating or damage the toroidal? I know when mounting a toroidal never to let the screw touch the top of the case as it would form a winding and could cause serious damage. I've seen some toroidals stuffed with tons of other components in a tight space but im just not sure if both sides of the toroidal were touching the cases. I'm a member of a few forums but I thought others might find information regarding toroidal transformers useful here. Ive got an alright bit of Diy builds under my belt and probably have 6 tube pieces but I just can't find information online regarding this specifically and what exactly I can get away with. Worse comes to worse I'll build an external psu but as of right now I have no noise in the unit and everything is operating perfectly. I just haven't put a lid on it. Thanks in advance guys.
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Post by jeromemason on Jun 6, 2015 23:07:05 GMT -6
Is it possible to vent the rubber? As in, could you cut small slots in it to allow air to flow around it?
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Post by ngallio on Jun 7, 2015 0:34:20 GMT -6
So I purchased an antek 05t240 (which is a 50va toroidal with 240v x 2 @250ma and 6.3v x 2 @3a filaments) for a dual channel tube eq I had built in a 1u size case. I'm using two of 6.3v lines for heaters for two tubes and the 250v for my ht. The eq is finished, does wonders and everything fits just perfectly. Everything but the toroidal which is a couple of hairs (or just 2 mm to tall). My question is If i install rubber around it and use a rubber pad on top (using plastic ties to mount it) would it cause over heating or damage the toroidal? I know when mounting a toroidal never to let the screw touch the top of the case as it would form a winding and could cause serious damage. I've seen some toroidals stuffed with tons of other components in a tight space but im just not sure if both sides of the toroidal were touching the cases. I'm a member of a few forums but I thought others might find information regarding toroidal transformers useful here. Ive got an alright bit of Diy builds under my belt and probably have 6 tube pieces but I just can't find information online regarding this specifically and what exactly I can get away with. Worse comes to worse I'll build an external psu but as of right now I have no noise in the unit and everything is operating perfectly. I just haven't put a lid on it. Thanks in advance guys. I don't see issues with the padding technique that you intend using but would wait for someone more experienced to chime in..
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Post by rocinante on Jun 7, 2015 0:49:26 GMT -6
Is it possible to vent the rubber? As in, could you cut small slots in it to allow air to flow around it? I believe its probably to thin for that. I guess ill mention I cut a circle out of metal using a hole saw that was small enough to be placed inside the hole of the toroidal without the circle falling through. This gives me the option of screwing the toroidal in place if i choose. I can then screw the rubber piece that comes with toroidals and use the metal circle as my anchor. I'm using a par-metal case which has sides that are completely ventilated.
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Post by jeromemason on Jun 7, 2015 1:04:17 GMT -6
I think you should be fine then.
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Post by svart on Jun 7, 2015 5:54:46 GMT -6
Whatever you do, do not allow the mounting screw that goes through the center of the toroid to touch both the bottom and top panels, or you'll create an electrical path that looks like a very short winding, and you'll have instant problems.
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Post by rocinante on Jun 7, 2015 19:47:24 GMT -6
Alright, considering nobody jumped in to say "don't do that you..." I'm gonna throw the lid on and see how it goes during a session tomorrow that I expect to last 1-2 hours. I imagine that should give me a good enough idea if it's gonna do any damage. Thanks a lot guys for chiming in. Btw: the eq is a dual channel helios 69 but as I already mentioned with a tube gain stage. It's. .. awesome.
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Post by rocinante on Jun 29, 2015 11:32:03 GMT -6
Alright I got another question. I'm building dual channel tube mic pre. It needs obviously multiple voltages; 250 x 2, 6.3v x 2, and 48v . I have my two psus; one formy hv and heaters and one for phantom and I plan on using two toroidals. Anything I need to keep in mind? I think im gonna keep the xfmrs in a external case and run a 6 prong xlr to the preamp. Thanks in advance Dylan
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