Triad Magnetics

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I called them once, they were not doing direct sales. Master Electronics has some in stock they are not cheap. is stocking them. Unfortunately, they are expensive to manufacture. We're building them in our California facility (USA) using the original paper-layered winding method, nickel lamination and deep-drawn mu-metal shield cans. We've upgraded the lead-wires to higher temp Teflon insulation vs. the original PVC making them easier to solder. In any case, the A-11J was $19.20 each in 1960, adjusted for inflation that would be $199.65 in 2023, so the price has actually decreased:
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This is badass. I love that a huge company like Triad is doing a sort of passion project. Kind of like Pilot making fountain pens.