Silyavski,
Thank you for that link - very good reading. Based on Jonathan's comments and your selection of the 40,000uF model then based on Neil's suggestion then you might only be getting 10,000uF (10,000uF x 2 /2). Any issues with running like that on your machine? If I use my board as-is then I'll only get 15,000uF.

Jonathan,
Thank you. I briefly looked at the toroid when it arrived to make sure all was intact and didn't notice the sticker on the side!
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As for modifying the board to get the full 60,000uF - the tracks are 'painted over' ; either that or it is a multilayer board because apart from the solder points there are no exposed tracks on the top or bottom. I'd probably have to demount the capacitors and run flying leads to them from the output of the rectifier.

Had a couple of minutes spare today so checked the output from the secondary coils:
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Mains was 243V AC and each secondary coil was 26.4V AC

I need to wire the secondarys in series but cannot find any markings on the cables to show which is the start of the winding. I've read that it does not matter how they are connected (unlike parallel which is vital). Can someone confirm this is the case?