The problem will be that the grado is terminated in a 1/4" phone plug or a 1/8" mini plug. The outputs on the Heathkit are likely to be speaker outs, they way you have described them. You will need an adapter. ASL sells one and I am sure there are others. It won't hurt the headphones and it will probably be best on the 16 ohm tap, but you can experiment.
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