What is going on with Erse?

General
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What is going on with Erse? Still in business? Have a website?

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ERSE USA folded when Jim Smolik died about 10 years ago now. The former employees started US Coils in Mentor, OH. The ERSE Asia company still exists and supplies the bobbins for SuperQ coils etc…

Here is what I want to know…

The US Coils website says the XQ model Coils are steel core on the product page, and would make sense for the DCR specs, but there is no datasheet, cross-sectional images, or such to explain that. My best guess would be a ring inside if that is the case.

I sent an email query to US Coils about this very thing and received no reply yet, about a week ago sent. My educated guess says it’s a typo or copied such from the SuperQ page, and that they are in fact air cores in reality.

I nay have to buy a pair to find out.

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I’ve used many Erse coils in the past and found them to be quite good and consistent.

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I have bought coils a few times form US Coils. They have been great to work with.

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If it was wound around a ring it would be torroidal wound. My bet is a copy-paste goof.

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I’m betting in this case, that there is likely no steel core.

However, I don’t necessarily agree that it would absolutely have to be toroidally wound. A lot of ferrite cored coils for example of this format are made with varying sizes of centrally bored RFI/EMI suppression ferrite beads. Madisound’s Sidewinder, Intertechnik’s Ferron bobbin, etc are made this way. Outside of the audio coil market, these are wound like toroidal transformers in most cases. In the coils like stated, the coil either has a bead placed inside the bobbin, or the coil is physically wound onto the ferrite bobbin like Jantzen’s P-cores. Intertechnik also used to make Torobar coils, a smaller version of Jantzen’s C-coils.

For the heck of it and to satisfy my curiosity, I ordered 8 toroidal Ferrite rings (4 of each style, so i can stack them at 1” core thickness. One is more rounded and uncoated, the other is painted and more square save for the edges) from Amazon. They are 1 3/8” ID, and 2 3/8” OD, half inch thick, and cost <$9 each. There are varying sizes, but this appears to be a standard model from several manufacturers. I also ordered a set of 12x 33mm OD rings, because they will snugly slide inside my 1.5” ID bobbinless coils.

I don’t know how I would even attempt a steel laminated ring core, so this will have to do. I will be torture testing them for HD purposes.

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You can buy Erse coils at Cinergy, as well.