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I hot glued a number of my toroids and it has not had any discernable effect on performance.? I was mostly concerned about the ones standing one and to keep another from sliding horizontally into a tabbed semiconductor device.? I used it sparingly.? Theoretically the introduction of dielectric material between turns can increase turn to turn capacitance which can affect coil Q, but a dab here or there should not have significant effect.

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Brien - KE7WB