Re: Fuses
I suppose if you want to make no internal modifications to the vintage device you could fit a fuseholder in a plastic box and wire the unit's mains cable into that (fuse in the live wire of course). That shouldn't be any more dangerous electrically than fitting a fuseholder in series with the live wire inside the set.
In the event of a catastrophic failure the plug fuse should still handle the high current available from the mains, and blow safely. For a more minor overcurrent that wouldn't blow the plug fuse, the added fuse will fail.
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