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2.? What amperage fuse should I use? Slow or fast blow?

since there will be inrush current to the transformer, a slow blow is best, that way you can use a lower rated fuse likely between 1 and 2 amps maybe 1.5? 1A [edited] as Steve mentioned, perhaps a bit more, depending on the transformer actual inrush?

If it were mine, and it had no mods, I would be reluctant to drill holes, but would want it fused, so I might put it in a polarized cord, going to the receiver, more like the fusing scheme used in Britain.

Hope it turns out well
73S don VA3DRL