[Luxman1050]

Yes I can see that there seems to be some kind of bakerlite plate attached to the metal screen with which looks like it may have had a 0.3amp fuse connected. Which is incredibly low rating! I have attached pic which shows where this plate might have gone. It is also appears to be all situated around the dropper resistor and mains selector. So maybe because it was set at 220v perminantly the fuse was omitted. Just a thought! and it was there if switched to 125v. As it shows the pole switch next to R37 and appears that you can break the fused circuit when selecting a voltage rating. As it shows the switch not in line with the fuse both are facing upward away from the fuse.

The mains input wiring on this set looks like it has been the same since manufactured as there seems to be no evidence of it being desoldered pic attached.

I think it's only draws max 50 watt. So I've installed a 3 amp fuse although I think you could get away with a 1 amp.

If non polarized would the chassis become 245v live? and what's best way of measuring whether the chasis is holding that voltage? Be very quick way for correcting the right orientation of the plug without shocking results. Bad joke I know.

Anyhow it should work now as all contacts nice and clean with exceptional continuity. I'll use variac.